php-doc-en/reference/misc/functions/php-check-syntax.xml

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<refentry xml:id="function.php-check-syntax" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>php_check_syntax</refname>
  <refpurpose>
   Check the PHP syntax of (and execute) the specified file
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>bool</type><methodname>php_check_syntax</methodname>
   <methodparam><type>string</type><parameter>filename</parameter></methodparam>
   <methodparam choice="opt"><type>string</type><parameter role="reference">error_message</parameter></methodparam>
  </methodsynopsis>
  <para>
   Performs a syntax (lint) check on the specified 
   <parameter>filename</parameter> testing for scripting errors.
  </para>
  <para>
   This is similar to using <command>php -l</command> from the <link
   linkend="features.commandline">commandline</link> except that this
   function will execute (but not output) the checked
   <parameter>filename</parameter>.
  </para>
  <para>
   For example, if a function is defined in <parameter>filename</parameter>,
   this defined function will be available to the file that executed 
   <function>php_check_syntax</function>, but output from 
   <parameter>filename</parameter> will be suppressed.
  </para>
  <note>
   <!-- See PHP bug #27406 for details on this suppression -->
   <para>
    For technical reasons, this function is deprecated and removed from PHP.
    Instead, use <literal>php -l somefile.php</literal> from the 
    <link linkend="features.commandline">commandline</link>.
   </para>
  </note>
 </refsect1>

 <refsect1 role="parameters">
 &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>filename</parameter></term>
     <listitem>
      <para>
       The name of the file being checked.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>error_message</parameter></term>
     <listitem>
      <para>
       If the <parameter>error_message</parameter> parameter is used, it will
       contain the error message generated by the syntax check. 
       <parameter>error_message</parameter> is passed by 
       <link linkend="language.references">reference</link>.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns &true; if the lint check passed, and &false; if the link check
   failed or if <parameter>filename</parameter> cannot be opened.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <para>
   <informaltable>
    <tgroup cols="2">
     <thead>
      <row>
       <entry>&Version;</entry>
       <entry>&Description;</entry>
      </row>
     </thead>
     <tbody>
      <row>
       <entry>5.0.5</entry>
       <entry>
        This function was removed from PHP.
       </entry>
      </row>
      <row>
       <entry>5.0.3</entry>
       <entry>
        Calling <function>exit</function> after 
        <function>php_check_syntax</function> resulted in a Segfault.
       </entry>
      </row>
      <row>
       <entry>5.0.1</entry>
       <entry>
        <parameter>error_message</parameter> is passed by reference.
       </entry>
      </row>
     </tbody>
    </tgroup>
   </informaltable>
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <screen>
<![CDATA[
php -l somefile.php
]]>
   </screen>
  </para>
  &example.outputs.similar;
  <para>
   <screen>
<![CDATA[
PHP Parse error: unexpected T_STRING in /tmp/somefile.php on line 81
]]>
   </screen>
  </para>    
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>include</function></member>
    <member><function>is_readable</function></member>
   </simplelist>
  </para>
 </refsect1>

</refentry>

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