To reset the callback:
assert_options(ASSERT_CALLBACK,null); // does not work
assert_options(ASSERT_CALLBACK,""); // appears to work
(PHP 4, PHP 5, PHP 7)
assert_options — 设置/获取断言的各种标志
what
| 标志 | INI 设置 | 默认值 | 描述 |
|---|---|---|---|
| ASSERT_ACTIVE | assert.active | 1 | 启用 assert() 断言 |
| ASSERT_WARNING | assert.warning | 1 | 为每个失败的断言产生一个 PHP 警告（warning） |
| ASSERT_BAIL | assert.bail | 0 | 在断言失败时中止执行 |
| ASSERT_QUIET_EVAL | assert.quiet_eval | 0 | 在断言表达式求值时禁用 error_reporting |
| ASSERT_CALLBACK | assert.callback | (NULL) |
断言失败时调用回调函数 |
value标志的新值。
返回任意标志的原始设置，出错时返回 FALSE。
Example #1 assert_options() 例子
<?php
// 处理断言失败时的函数
function assert_failure()
{
echo 'Assert failed';
}
// 我们的测试函数
function test_assert($parameter)
{
assert(is_bool($parameter));
}
// 设置断言标志
assert_options(ASSERT_ACTIVE, true);
assert_options(ASSERT_BAIL, true);
assert_options(ASSERT_WARNING, false);
assert_options(ASSERT_CALLBACK, 'assert_failure');
// 让一个断言会失败
test_assert(1);
// 由于 ASSERT_BAIL 是 true，这里永远也到不了
echo 'Never reached';
?>
To reset the callback:
assert_options(ASSERT_CALLBACK,null); // does not work
assert_options(ASSERT_CALLBACK,""); // appears to work
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 ...