assert_options

(PHP 4, PHP 5, PHP 7, PHP 8)

assert_options — Set/get the various assert flags

Warning

This function has been DEPRECATED as of PHP 8.3.0. Relying on this function is highly discouraged.

Description

assert_options(int $option, mixed $value = ?): mixed

Set the various assert() control options or just query their current settings.

Note: The use of assert_options() is discouraged in favor of setting and getting the php.ini directives zend.assertions and assert.exception with ini_set() and ini_get(), respectively.

Parameters

option

**Assert Options**
Option	INI Setting	Default value	Description
ASSERT_ACTIVE	assert.active	1	enable assert() evaluation
ASSERT_EXCEPTION	assert.exception	1	throws an AssertionError for each failed assertions
ASSERT_WARNING	assert.warning	1	issue a PHP warning for each failed assertion
ASSERT_BAIL	assert.bail	0	terminate execution on failed assertions
ASSERT_QUIET_EVAL	assert.quiet_eval	0	disable error_reporting during assertion expression evaluation. Removed as of PHP 8.0.0.
ASSERT_CALLBACK	assert.callback	(`null`)	Callback to call on failed assertions

value

An optional new value for the option.

The callback function set via ASSERT_CALLBACK or assert.callback should have the following signature:

assert_callback(
    string $file,
    int $line,
    ?string $assertion,
    string $description = ?
): void

file: The file where assert() has been called.
line: The line where assert() has been called.
assertion: Prior to PHP 8.0.0, the assertion which has been passed to assert(), but only when the assertion is given as a string. (If the assertion is a boolean condition, this parameter will be an empty string.) As of PHP 8.0.0, this parameter is always null.
description: The description that has been passed to assert().

Passing an empty string as value resets the assert callback.

Return Values

Returns the original setting of any option.

Errors/Exceptions

If option is not a valid option a ValueError is thrown.

Changelog

Version	Description
8.3.0	assert_option() is now deprecated.
8.0.0	If `option` is not a valid option, a ValueError is now thrown. Previously `false` was returned.

Examples

Example #1 assert_options() example

<?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';
?>

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User Contributed Notes 1 note

down

Fr?d?ric Bouchery ¶

21 years ago

Here is an exemple how to use the assertion callback function :

<?php
  assert_options( ASSERT_CALLBACK, 'assert_callback');

  function assert_callback( $script, $line, $message ) {
    echo 'You have a design error in your script <b>', $script,'</b> : line <b>', $line,'</b> :<br />';
    echo '<b>', ereg_replace( '^.*//\*', '', $message ), '</b><br /><br />';
    echo 'Open the source file and check it, because it\'s not a normal behaviour !';
    exit;
  }

$x = 3;
assert('is_integer( $x ) && ($x >= 0) && ($x <= 10); //* $x must be an integer value from 0 to 10' );
  echo "0 <= $x <= 10";
?>

assertion is usefull for "design by contract" methodology ...