php-doc-en/reference/info/functions/assert-options.xml

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<refentry xml:id="function.assert-options" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>assert_options</refname>
  <refpurpose>Set/get the various assert flags</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>mixed</type><methodname>assert_options</methodname>
   <methodparam><type>int</type><parameter>what</parameter></methodparam>
   <methodparam choice="opt"><type>mixed</type><parameter>value</parameter></methodparam>
  </methodsynopsis>
  <para>
   Set the various <function>assert</function> control options or just query
   their current settings.
  </para>
  <note>
   <simpara>
    As of PHP 7.0.0, the use of <function>assert_options</function> is discouraged
    in favor of setting and getting the &php.ini; directives
    <link linkend="ini.zend.assertions">zend.assertions</link> and
    <link linkend="ini.assert.exception">assert.exception</link> with
    <function>ini_set</function> and <function>ini_get</function>, respectively.
   </simpara>
  </note>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>what</parameter></term>
     <listitem>
      <para>
       <table>
        <title>Assert Options</title>
        <tgroup cols="4">
         <thead>
          <row>
           <entry>Option</entry>
           <entry>INI Setting</entry>
           <entry>Default value</entry>
           <entry>Description</entry>
          </row>
         </thead>
         <tbody>
          <row>
           <entry>ASSERT_ACTIVE</entry>
           <entry>assert.active</entry>
           <entry>1</entry>
           <entry>enable <function>assert</function> evaluation</entry>
          </row>
          <row>
           <entry>ASSERT_WARNING</entry>
           <entry>assert.warning</entry>
           <entry>1</entry>
           <entry>issue a PHP warning for each failed assertion</entry>
          </row>
          <row>
           <entry>ASSERT_BAIL</entry>
           <entry>assert.bail</entry>
           <entry>0</entry>
           <entry>terminate execution on failed assertions</entry>
          </row>
          <row>
           <entry>ASSERT_QUIET_EVAL</entry>
           <entry>assert.quiet_eval</entry>
           <entry>0</entry>
           <entry>
            disable error_reporting during assertion expression
            evaluation
           </entry>
          </row>
          <row>
           <entry>ASSERT_CALLBACK</entry>
           <entry>assert.callback</entry>
           <entry>(&null;)</entry>
           <entry>Callback to call on failed assertions</entry>
          </row>
         </tbody>
        </tgroup>
       </table>
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>value</parameter></term>
     <listitem>
      <para>
       An optional new value for the option.
      </para>
      <para>
       The callback function set via <constant>ASSERT_CALLBACK</constant> or assert.callback should
       have the following signature:
       <methodsynopsis role="procedural">
        <type>void</type><methodname>assert_callback</methodname>
        <methodparam><type>string</type><parameter>file</parameter></methodparam>
        <methodparam><type>int</type><parameter>line</parameter></methodparam>
        <methodparam><type>string</type><parameter>assertion</parameter></methodparam>
        <methodparam choice="opt"><type>string</type><parameter>description</parameter></methodparam>
       </methodsynopsis>
       <variablelist>
        <varlistentry>
         <term><parameter>file</parameter></term>
         <listitem>
          <simpara>
           The file where <function>assert</function> has been called.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>line</parameter></term>
         <listitem>
          <simpara>
           The line where <function>assert</function> has been called.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>assertion</parameter></term>
         <listitem>
          <simpara>
           The assertion that has been passed to <function>assert</function>,
           converted to a string.
          </simpara>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>description</parameter></term>
         <listitem>
          <simpara>
           The description that has been passed to <function>assert</function>.
          </simpara>
         </listitem>
        </varlistentry>
       </variablelist>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
   Passing an empty string as <parameter>value</parameter> resets the assert callback.
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns the original setting of any option or &false; on errors.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
   <title><function>assert_options</function> example</title>
   <programlisting role="php">
<![CDATA[
<?php
// This is our function to handle 
// assert failures
function assert_failure($file, $line, $assertion, $message)
{
    echo "The assertion $assertion in $file on line $line has failed: $message";
}

// This is our test function
function test_assert($parameter)
{
    assert(is_bool($parameter));
}

// Set our assert options
assert_options(ASSERT_ACTIVE,   true);
assert_options(ASSERT_BAIL,     true);
assert_options(ASSERT_WARNING,  false);
assert_options(ASSERT_CALLBACK, 'assert_failure');

// Make an assert that would fail
test_assert(1);

// This is never reached due to ASSERT_BAIL 
// being true
echo 'Never reached';
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>

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

</refentry>

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