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<h1 class="refname">json_last_error</h1>
<p class="verinfo">(PHP 5 >= 5.3.0)</p><p class="refpurpose"><span class="refname">json_last_error</span> — <span class="dc-title">Returns the last error occurred</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.json-last-error-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">int</span> <span class="methodname"><strong>json_last_error</strong></span>
( <span class="methodparam">void</span>
)</div>
<p class="para rdfs-comment">
Returns the last error (if any) occurred during the last JSON encoding/decoding.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.json-last-error-parameters">
<h3 class="title">Parameters</h3>
<p class="para">This function has no parameters.</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.json-last-error-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns an integer, the value can be one of the following
constants:
</p>
<table class="doctable table">
<caption><strong>JSON error codes</strong></caption>
<thead>
<tr>
<th>Constant</th>
<th>Meaning</th>
<th>Availability</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td><strong><code>JSON_ERROR_NONE</code></strong></td>
<td>No error has occurred</td>
<td class="empty"> </td>
</tr>
<tr>
<td><strong><code>JSON_ERROR_DEPTH</code></strong></td>
<td>The maximum stack depth has been exceeded</td>
<td class="empty"> </td>
</tr>
<tr>
<td><strong><code>JSON_ERROR_STATE_MISMATCH</code></strong></td>
<td>Invalid or malformed JSON</td>
<td class="empty"> </td>
</tr>
<tr>
<td><strong><code>JSON_ERROR_CTRL_CHAR</code></strong></td>
<td>Control character error, possibly incorrectly encoded</td>
<td class="empty"> </td>
</tr>
<tr>
<td><strong><code>JSON_ERROR_SYNTAX</code></strong></td>
<td>Syntax error</td>
<td class="empty"> </td>
</tr>
<tr>
<td><strong><code>JSON_ERROR_UTF8</code></strong></td>
<td>Malformed UTF-8 characters, possibly incorrectly encoded</td>
<td>PHP 5.3.3</td>
</tr>
<tr>
<td><strong><code>JSON_ERROR_RECURSION</code></strong></td>
<td>One or more recursive references in the value to be encoded</td>
<td>PHP 5.5.0</td>
</tr>
<tr>
<td><strong><code>JSON_ERROR_INF_OR_NAN</code></strong></td>
<td>
One or more
<a href="language.types.float.html#language.types.float.nan" class="link"><strong><code>NAN</code></strong></a>
or <a href="function.is-infinite.html" class="link"><strong><code>INF</code></strong></a>
values in the value to be encoded
</td>
<td>PHP 5.5.0</td>
</tr>
<tr>
<td><strong><code>JSON_ERROR_UNSUPPORTED_TYPE</code></strong></td>
<td>A value of a type that cannot be encoded was given</td>
<td>PHP 5.5.0</td>
</tr>
</tbody>
</table>
</div>
<div class="refsect1 examples" id="refsect1-function.json-last-error-examples">
<h3 class="title">Examples</h3>
<p class="para">
<div class="example" id="example-3763">
<p><strong>Example #1 <span class="function"><strong>json_last_error()</strong></span> example</strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// A valid json string<br /></span><span style="color: #0000BB">$json</span><span style="color: #007700">[] = </span><span style="color: #DD0000">'{"Organization": "PHP Documentation Team"}'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// An invalid json string which will cause an syntax <br />// error, in this case we used ' instead of " for quotation<br /></span><span style="color: #0000BB">$json</span><span style="color: #007700">[] = </span><span style="color: #DD0000">"{'Organization': 'PHP Documentation Team'}"</span><span style="color: #007700">;<br /><br /><br />foreach (</span><span style="color: #0000BB">$json </span><span style="color: #007700">as </span><span style="color: #0000BB">$string</span><span style="color: #007700">) {<br /> echo </span><span style="color: #DD0000">'Decoding: ' </span><span style="color: #007700">. </span><span style="color: #0000BB">$string</span><span style="color: #007700">;<br /> </span><span style="color: #0000BB">json_decode</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">);<br /><br /> switch (</span><span style="color: #0000BB">json_last_error</span><span style="color: #007700">()) {<br /> case </span><span style="color: #0000BB">JSON_ERROR_NONE</span><span style="color: #007700">:<br /> echo </span><span style="color: #DD0000">' - No errors'</span><span style="color: #007700">;<br /> break;<br /> case </span><span style="color: #0000BB">JSON_ERROR_DEPTH</span><span style="color: #007700">:<br /> echo </span><span style="color: #DD0000">' - Maximum stack depth exceeded'</span><span style="color: #007700">;<br /> break;<br /> case </span><span style="color: #0000BB">JSON_ERROR_STATE_MISMATCH</span><span style="color: #007700">:<br /> echo </span><span style="color: #DD0000">' - Underflow or the modes mismatch'</span><span style="color: #007700">;<br /> break;<br /> case </span><span style="color: #0000BB">JSON_ERROR_CTRL_CHAR</span><span style="color: #007700">:<br /> echo </span><span style="color: #DD0000">' - Unexpected control character found'</span><span style="color: #007700">;<br /> break;<br /> case </span><span style="color: #0000BB">JSON_ERROR_SYNTAX</span><span style="color: #007700">:<br /> echo </span><span style="color: #DD0000">' - Syntax error, malformed JSON'</span><span style="color: #007700">;<br /> break;<br /> case </span><span style="color: #0000BB">JSON_ERROR_UTF8</span><span style="color: #007700">:<br /> echo </span><span style="color: #DD0000">' - Malformed UTF-8 characters, possibly incorrectly encoded'</span><span style="color: #007700">;<br /> break;<br /> default:<br /> echo </span><span style="color: #DD0000">' - Unknown error'</span><span style="color: #007700">;<br /> break;<br /> }<br /><br /> echo </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />}<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
Decoding: {"Organization": "PHP Documentation Team"} - No errors
Decoding: {'Organization': 'PHP Documentation Team'} - Syntax error, malformed JSON
</pre></div>
</div>
</div>
</p>
<p class="para">
<div class="example" id="example-3764">
<p><strong>Example #2 <span class="function"><strong>json_last_error()</strong></span> with <span class="function"><a href="function.json-encode.html" class="function">json_encode()</a></span></strong></p>
<div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// An invalid UTF8 sequence<br /></span><span style="color: #0000BB">$text </span><span style="color: #007700">= </span><span style="color: #DD0000">"\xB1\x31"</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">$json </span><span style="color: #007700">= </span><span style="color: #0000BB">json_encode</span><span style="color: #007700">(</span><span style="color: #0000BB">$text</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$error </span><span style="color: #007700">= </span><span style="color: #0000BB">json_last_error</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$json</span><span style="color: #007700">, </span><span style="color: #0000BB">$error </span><span style="color: #007700">=== </span><span style="color: #0000BB">JSON_ERROR_UTF8</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
string(4) "null"
bool(true)
</pre></div>
</div>
</div>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.json-last-error-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.json-last-error-msg.html" class="function" rel="rdfs-seeAlso">json_last_error_msg()</a> - Returns the error string of the last json_encode() or json_decode() call</span></li>
<li class="member"> <span class="function"><a href="function.json-decode.html" class="function" rel="rdfs-seeAlso">json_decode()</a> - Decodes a JSON string</span></li>
<li class="member"> <span class="function"><a href="function.json-encode.html" class="function" rel="rdfs-seeAlso">json_encode()</a> - Returns the JSON representation of a value</span></li>
</ul>
</p>
</div>
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