assert_options

(PHP 4, PHP 5, PHP 7)

assert_options — Set/get the various assert flags

설명

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

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

인수

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.

반환값

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

예제

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';
?>

참고

assert() - Checks if assertion is FALSE

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User Contributed Notes 1 note

down

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 ...

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