assert_options

Description

mixed assert_options ( int what [, mixed value] )

Using assert_options() you may set the various assert() control options or just query their current settings.

表格 1. Assert Options

option	ini-parameter	default	description
ASSERT_ACTIVE	assert.active	1	enable assert() evaluation
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
ASSERT_CALLBACK	assert.callback	(`NULL`)	user function to call on failed assertions

assert_options() will return the original setting of any option or FALSE on errors.

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Frdric Bouchery
21-Jul-2003 07:25


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 ...

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