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assert_options

(PHP 4, PHP 5)

assert_optionsSet/get the various assert flags

说明

mixed assert_options ( int $what [, mixed $value ] )

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

参数

what

Assert Options
Option INI Setting Default value 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) Callback to call on failed assertions

value

An optional new value for the option.

返回值

Returns the original setting of any option or FALSE on errors.

范例

Example #1 assert_options() example

<?php
// This is our function to handle 
// assert failures
function assert_failure()
{
    echo 
'Assert failed';
}

// 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';
?>

参见


PHP 选项/信息 函数
在线手册:中文 英文
PHP手册
PHP手册 - N: Set/get the various assert flags

用户评论:

Frdric Bouchery (21-Jul-2003 12:25)

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 ...