doc-en/reference/simdjson/functions/simdjson-is-valid.xml

<?xml version="1.0" encoding="utf-8"?>
<refentry xml:id="function.simdjson-is-valid" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 <refnamediv>
  <refname>simdjson_is_valid</refname>
  <refpurpose>Check if a JSON string is valid</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>simdjson_is_valid</methodname>
   <methodparam><type>string</type><parameter>json</parameter><initializer>&false;</initializer></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>depth</parameter><initializer>512</initializer></methodparam>
  </methodsynopsis>
  <para>
   Takes a JSON encoded string and returns true if it is valid.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <variablelist>
   <varlistentry>
    <term><parameter>json</parameter></term>
    <listitem>
      <para>
       The <parameter>json</parameter> <type>string</type> being validated.
      </para>
      <para>
       This function only works with UTF-8 encoded strings.
      </para>
      <para>
       This function validates inputs which
       <function>json_decode</function> can decode,
       provided that they are less than 4 GiB long.
      </para>
    </listitem>
   </varlistentry>
   <varlistentry>
    <term><parameter>depth</parameter></term>
    <listitem>
     <para>
      Maximum nesting depth of the structure being validated.
      The value must be greater than <literal>0</literal>,
      and less than or equal to <literal>2147483647</literal>.

      Callers should use reasonably small values,
      because larger depths require more buffer space and will
      increase the recursion depth, unlike the current <function>json_decode</function> implementation.
     </para>
    </listitem>
   </varlistentry>
  </variablelist>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if <parameter>json</parameter> is a valid JSON
   string, &false; otherwise.
  </para>
 </refsect1>

 <refsect1 role="errors">
  &reftitle.errors;
  <para>
   If <parameter>json</parameter> is longer than 4 GiB, a <classname>SimdJsonException</classname> is thrown as of PECL simdjson 2.1.0,
   while previously, a <classname>RuntimeException</classname> was thrown.
  </para>
  <para>
   If <parameter>depth</parameter> is outside the allowed range,
   a <classname>SimdJsonValueError</classname> is thrown as of PECL simdjson 3.0.0,
   while previously, an error of level <constant>E_WARNING</constant> was raised.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title><function>simdjson_decode</function> examples</title>
    <programlisting role="php">
<![CDATA[
<?php
$json = '{"a":1,"b":2,"c":3}';
$invalidJson = '{"a":1,"b":2,"c":';

var_dump(simdjson_is_valid($json));
var_dump(simdjson_is_valid($invalidJson));

?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
bool(true)
bool(false)
]]>
    </screen>
   </example>
   <example>
    <title><parameter>depth</parameter> errors</title>
    <programlisting role="php">
<![CDATA[
<?php
// Encode some data with a maximum depth of 4
// (array -> array -> array -> string)
$json = json_encode(
    [
        1 => [
            'English' => [
                'One',
                'January'
            ],
            'French' => [
                'Une',
                'Janvier'
            ]
        ]
    ]
);

// Show the errors for different depths.
var_dump(simdjson_is_valid($json, 4));
var_dump(simdjson_is_valid($json, 3));
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
bool(true)
bool(false)
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="notes">
  &reftitle.notes;
  <note>
   <para>
    The JSON spec is not JavaScript, but a subset of JavaScript.
   </para>
  </note>
  <note>
   <para>
    In the event of a failure to decode,
    a <classname>SimdJsonException</classname> is thrown
    and <methodname>SimdJsonException::getCode</methodname> and
    <methodname>SimdJsonException::getMessage</methodname> can be used
    to determine the exact nature of the error.
   </para>
  </note>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>json_encode</function></member>
    <member><function>json_decode</function></member>
   </simplelist>
  </para>
 </refsect1>
</refentry>
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