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140 lines
3.3 KiB
XML
140 lines
3.3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- EN-Revision: 16934048f79c6e117cd16a23c09c1b2ea502e284 Maintainer: mowangjuanzi Status: ready -->
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<sect1 xml:id="language.operators.array">
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<title>数组运算符</title>
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<titleabbrev>数组</titleabbrev>
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<table>
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<title>数组运算符</title>
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<tgroup cols="3">
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<thead>
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<row>
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<entry>例子</entry>
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<entry>名称</entry>
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<entry>结果</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>$a + $b</entry>
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<entry>联合</entry>
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<entry><varname>$a</varname> 和 <varname>$b</varname> 的联合。</entry>
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</row>
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<row>
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<entry>$a == $b</entry>
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<entry>相等</entry>
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<entry>如果 <varname>$a</varname> 和 <varname>$b</varname> 具有相同的键／值对则为 &true;。</entry>
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</row>
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<row>
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<entry>$a === $b</entry>
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<entry>全等</entry>
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<entry>如果 <varname>$a</varname> 和 <varname>$b</varname> 具有相同的键／值对并且顺序和类型都相同则为 &true;。</entry>
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</row>
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<row>
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<entry>$a != $b</entry>
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<entry>不等</entry>
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<entry>如果 <varname>$a</varname> 不等于 <varname>$b</varname> 则为 &true;。</entry>
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</row>
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<row>
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<entry>$a <> $b</entry>
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<entry>不等</entry>
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<entry>如果 <varname>$a</varname> 不等于 <varname>$b</varname> 则为 &true;。</entry>
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</row>
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<row>
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<entry>$a !== $b</entry>
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<entry>不全等</entry>
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<entry>如果 <varname>$a</varname> 不全等于 <varname>$b</varname> 则为 &true;。</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<para>
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<literal>+</literal> 运算符把右边的数组元素附加到左边的数组后面，两个数组中都有的键名，则只用左边数组中的，右边的被忽略。
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</para>
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<para>
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<example>
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<title>数组追加运算符</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$a = array("a" => "apple", "b" => "banana");
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$b = array("a" => "pear", "b" => "strawberry", "c" => "cherry");
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$c = $a + $b; // $a 和 $b 的并集
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echo "Union of \$a and \$b: \n";
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var_dump($c);
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$c = $b + $a; // $b 和 $a 的并集
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echo "Union of \$b and \$a: \n";
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var_dump($c);
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$a += $b; // $a += $b 的并集是 $a 和 $b
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echo "Union of \$a += \$b: \n";
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var_dump($a);
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?>
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]]>
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</programlisting>
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&example.outputs;
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<screen role="php">
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<![CDATA[
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Union of $a and $b:
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array(3) {
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["a"]=>
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string(5) "apple"
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["b"]=>
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string(6) "banana"
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["c"]=>
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string(6) "cherry"
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}
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Union of $b and $a:
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array(3) {
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["a"]=>
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string(4) "pear"
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["b"]=>
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string(10) "strawberry"
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["c"]=>
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string(6) "cherry"
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}
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Union of $a += $b:
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array(3) {
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["a"]=>
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string(5) "apple"
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["b"]=>
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string(6) "banana"
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["c"]=>
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string(6) "cherry"
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}
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]]>
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</screen>
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</example>
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</para>
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<para>
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数组中的单元如果具有相同的键名和值则比较时相等。
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</para>
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<para>
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<example>
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<title>比较数组</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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$a = array("apple", "banana");
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$b = array(1 => "banana", "0" => "apple");
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var_dump($a == $b); // bool(true)
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var_dump($a === $b); // bool(false)
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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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<sect2 role="seealso">
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&reftitle.seealso;
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<para>
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<simplelist>
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<member><link linkend="language.types.array">数组类型</link></member>
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<member><link linkend="ref.array">数组函数</link></member>
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</simplelist>
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</para>
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</sect2>
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</sect1>
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