/
json-last-error.xml
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/
json-last-error.xml
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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="function.json-last-error" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>json_last_error</refname>
<refpurpose>Returns the last error occurred</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>int</type><methodname>json_last_error</methodname>
<void />
</methodsynopsis>
<para>
Returns the last error (if any) occurred during the last JSON encoding/decoding.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
&no.function.parameters;
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Returns an integer, the value can be one of the following
constants:
</para>
<table>
<title>JSON error codes</title>
<tgroup cols="2">
<thead>
<row>
<entry>Constant</entry>
<entry>Meaning</entry>
<entry>Availability</entry>
</row>
</thead>
<tbody>
<row>
<entry><constant>JSON_ERROR_NONE</constant></entry>
<entry>No error has occurred</entry>
<entry></entry>
</row>
<row>
<entry><constant>JSON_ERROR_DEPTH</constant></entry>
<entry>The maximum stack depth has been exceeded</entry>
<entry></entry>
</row>
<row>
<entry><constant>JSON_ERROR_STATE_MISMATCH</constant></entry>
<entry>Invalid or malformed JSON</entry>
<entry></entry>
</row>
<row>
<entry><constant>JSON_ERROR_CTRL_CHAR</constant></entry>
<entry>Control character error, possibly incorrectly encoded</entry>
<entry></entry>
</row>
<row>
<entry><constant>JSON_ERROR_SYNTAX</constant></entry>
<entry>Syntax error</entry>
<entry></entry>
</row>
<row>
<entry><constant>JSON_ERROR_UTF8</constant></entry>
<entry>Malformed UTF-8 characters, possibly incorrectly encoded</entry>
<entry>PHP 5.3.3</entry>
</row>
<row>
<entry><constant>JSON_ERROR_RECURSION</constant></entry>
<entry>One or more recursive references in the value to be encoded</entry>
<entry>PHP 5.5.0</entry>
</row>
<row>
<entry><constant>JSON_ERROR_INF_OR_NAN</constant></entry>
<entry>
One or more
<link linkend="language.types.float.nan"><constant>NAN</constant></link>
or <link linkend="function.is-infinite"><constant>INF</constant></link>
values in the value to be encoded
</entry>
<entry>PHP 5.5.0</entry>
</row>
<row>
<entry><constant>JSON_ERROR_UNSUPPORTED_TYPE</constant></entry>
<entry>A value of a type that cannot be encoded was given</entry>
<entry>PHP 5.5.0</entry>
</row>
<row>
<entry><constant>JSON_ERROR_INVALID_PROPERTY_NAME</constant></entry>
<entry>A property name that cannot be encoded was given</entry>
<entry>PHP 7.0.0</entry>
</row>
<row>
<entry><constant>JSON_ERROR_UTF16</constant></entry>
<entry>Malformed UTF-16 characters, possibly incorrectly encoded</entry>
<entry>PHP 7.0.0</entry>
</row>
</tbody>
</tgroup>
</table>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>json_last_error</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
// A valid json string
$json[] = '{"Organization": "PHP Documentation Team"}';
// An invalid json string which will cause an syntax
// error, in this case we used ' instead of " for quotation
$json[] = "{'Organization': 'PHP Documentation Team'}";
foreach ($json as $string) {
echo 'Decoding: ' . $string;
json_decode($string);
switch (json_last_error()) {
case JSON_ERROR_NONE:
echo ' - No errors';
break;
case JSON_ERROR_DEPTH:
echo ' - Maximum stack depth exceeded';
break;
case JSON_ERROR_STATE_MISMATCH:
echo ' - Underflow or the modes mismatch';
break;
case JSON_ERROR_CTRL_CHAR:
echo ' - Unexpected control character found';
break;
case JSON_ERROR_SYNTAX:
echo ' - Syntax error, malformed JSON';
break;
case JSON_ERROR_UTF8:
echo ' - Malformed UTF-8 characters, possibly incorrectly encoded';
break;
default:
echo ' - Unknown error';
break;
}
echo PHP_EOL;
}
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
Decoding: {"Organization": "PHP Documentation Team"} - No errors
Decoding: {'Organization': 'PHP Documentation Team'} - Syntax error, malformed JSON
]]>
</screen>
</example>
</para>
<para>
<example>
<title><function>json_last_error</function> with <function>json_encode</function></title>
<programlisting role="php">
<![CDATA[
<?php
// An invalid UTF8 sequence
$text = "\xB1\x31";
$json = json_encode($text);
$error = json_last_error();
var_dump($json, $error === JSON_ERROR_UTF8);
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
string(4) "null"
bool(true)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>json_last_error_msg</function></member>
<member><function>json_decode</function></member>
<member><function>json_encode</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
<!-- Keep this comment at the end of the file
Local variables:
mode: sgml
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sgml-shorttag:t
sgml-minimize-attributes:nil
sgml-always-quote-attributes:t
sgml-indent-step:1
sgml-indent-data:t
indent-tabs-mode:nil
sgml-parent-document:nil
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
sgml-exposed-tags:nil
sgml-local-catalogs:nil
sgml-local-ecat-files:nil
End:
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vim: et tw=78 syn=sgml
vi: ts=1 sw=1
-->