mirror of
https://github.com/php/doc-zh.git
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276 lines
6.8 KiB
XML
276 lines
6.8 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision$ -->
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<!-- EN-Revision: 45042fef652f1b4e904e809fcbfcf31f6c60670b Maintainer: HonestQiao Status: ready -->
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<!-- CREDITS: Luffy, mowangjuanzi -->
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<refentry xml:id="function.explode" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>explode</refname>
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<refpurpose>使用一个字符串分割另一个字符串</refpurpose>
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>array</type><methodname>explode</methodname>
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<methodparam><type>string</type><parameter>separator</parameter></methodparam>
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<methodparam><type>string</type><parameter>string</parameter></methodparam>
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<methodparam choice="opt"><type>int</type><parameter>limit</parameter><initializer><constant>PHP_INT_MAX</constant></initializer></methodparam>
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</methodsynopsis>
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<para>
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此函数返回由字符串组成的数组，每个元素都是
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<parameter>string</parameter>
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的一个子串，它们被字符串
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<parameter>separator</parameter>
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作为边界点分割出来。
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.parameters;
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>separator</parameter></term>
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<listitem>
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<para>
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边界上的分隔字符。
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>string</parameter></term>
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<listitem>
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<para>
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输入的字符串。
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>limit</parameter></term>
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<listitem>
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<para>
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如果设置了
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<parameter>limit</parameter>
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参数并且是正数，则返回的数组包含最多
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<parameter>limit</parameter>
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个元素，而最后那个元素将包含
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<parameter>string</parameter>
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的剩余部分。
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</para>
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<para>
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如果
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<parameter>limit</parameter>
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参数是负数，则返回除了最后的
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-<parameter>limit</parameter>
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个元素外的所有元素。
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</para>
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<para>
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如果 <parameter>limit</parameter> 是 0，则会被当做 1。
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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<note>
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<para>
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在 PHP 8.0 之前，<function>implode</function> 可以接收两种参数顺序。
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但请注意，<function>explode</function> 从未支持乱序传入参数：你必须保证
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<parameter>separator</parameter> 参数在
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<parameter>string</parameter> 参数之前。
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</para>
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</note>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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此函数返回由字符串组成的 <type>array</type>，每个元素都是
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<parameter>string</parameter>
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的一个子串，它们被字符串
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<parameter>separator</parameter>
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作为边界点分割出来。
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</para>
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<para>
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如果 <parameter>separator</parameter>
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为空字符串（""），<function>explode</function>
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将抛出 <classname>ValueError</classname>。
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如果
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<parameter>separator</parameter>
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所包含的值在
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<parameter>string</parameter>
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中找不到，并且使用了负数的 <parameter>limit</parameter> ，
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那么会返回空的 <type>array</type>，
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否则返回包含 <parameter>string</parameter>
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单个元素的数组。
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如果 <parameter>separator</parameter> 值出现在了
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<parameter>string</parameter> 参数的开头或末尾，
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将在返回 <type>array</type> 相应的头部或尾部添加 <type>array</type> 空值。
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</para>
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</refsect1>
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<refsect1 role=" changelog">
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&reftitle.changelog;
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<informaltable>
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<tgroup cols="2">
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<thead>
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<row>
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<entry>&Version;</entry>
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<entry>&Description;</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>8.0.0</entry>
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<entry>
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现在开始，当 <parameter>separator</parameter> 参数传入空字符串时（<literal>""</literal>），
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<function>explode</function> 会抛出 <classname>ValueError</classname>。
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在早期版本中，<function>explode</function> 会返回 &false;。
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</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</refsect1>
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<refsect1 role="examples">
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&reftitle.examples;
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<para>
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<example>
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<title><function>explode</function> 例子</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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// 示例 1
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$pizza = "piece1 piece2 piece3 piece4 piece5 piece6";
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$pieces = explode(" ", $pizza);
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echo $pieces[0], PHP_EOL; // piece1
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echo $pieces[1], PHP_EOL; // piece2
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// 示例 2
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$data = "foo:*:1023:1000::/home/foo:/bin/sh";
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list($user, $pass, $uid, $gid, $gecos, $home, $shell) = explode(":", $data);
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echo $user, PHP_EOL; // foo
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echo $pass, PHP_EOL; // *
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?>
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]]>
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</programlisting>
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</example>
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</para>
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<para>
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<example>
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<title><function>explode</function> return examples</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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/*
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字符串内不包含分隔字符时，
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会简单返回只有一个原始字符串元素的 array。
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*/
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$input1 = "hello";
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$input2 = "hello,there";
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$input3 = ',';
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var_dump( explode( ',', $input1 ) );
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var_dump( explode( ',', $input2 ) );
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var_dump( explode( ',', $input3 ) );
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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array(1)
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(
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[0] => string(5) "hello"
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)
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array(2)
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(
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[0] => string(5) "hello"
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[1] => string(5) "there"
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)
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array(2)
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(
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[0] => string(0) ""
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[1] => string(0) ""
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)
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]]>
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</screen>
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</example>
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</para>
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<para>
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<example>
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<title><parameter>limit</parameter> 参数的例子</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$str = 'one|two|three|four';
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// 正数的 limit
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print_r(explode('|', $str, 2));
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// 负数的 limit
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print_r(explode('|', $str, -1));
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen>
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<![CDATA[
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Array
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(
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[0] => one
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[1] => two|three|four
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)
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Array
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(
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[0] => one
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[1] => two
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[2] => three
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)
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]]>
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</screen>
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</example>
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</para>
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</refsect1>
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<refsect1 role="notes">
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&reftitle.notes;
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¬e.bin-safe;
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</refsect1>
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<refsect1 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><function>preg_split</function></member>
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<member><function>str_split</function></member>
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<member><function>mb_split</function></member>
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<member><function>str_word_count</function></member>
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<member><function>strtok</function></member>
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<member><function>implode</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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