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PHP里有非常丰富的内|函敎ͼ很多我们都用q,但仍有很多的函数我们大部分h都不熟悉Q可它们却十分的有用。这文章里Q我列D了一些鲜Zh知但会让你眼睛一亮的PHP函数?/span>
levenshtein()
你有没有l历q需要知道两个单词有多大的不同的时候,q个函数是来帮你解册个问题的。它能比较出两个字符串的不同E度?/span>
用法Q?/span>
<?php
$str1 = “carrot?
$str2 = “carrrott?
echo levenshtein($str1, $str2); //Outputs 2
?>
Source: http://php.net/manual/en/function.levenshtein.php
get_defined_vars()
q是一个在debug调试旉常有用的函数。这个函数返回一个多l数l,里面包含了所有定义过的变量?/span>
用法Q?/span>
<?php
print_r(get_defined_vars());
?>
Source: http://php.net/manual/en/function.get-defined-vars.php
php_check_syntax()
q个函数非常的有用,可以用来查PHP的语法是否正。出于技术上的原因,从PHP 5.05开始,q个函数被删除了?/span>
用法Q?/span>
<?php
$error_message = “?
$filename = ?/php_script.php?
if(!php_check_syntax($filename, &$error_message)) {
echo “Errors were found in the file $filename: $error_message?
} else {
echo “The file $filename contained no syntax errors?
}
?>
Source: http://www.php.net/manual/en/function.php-check-syntax.php
ignore_user_abort()
q个函数用来拒绝览器端用户l止执行脚本的请求。正常情况下客户端的退ZD服务器端脚本停止q行?/span>
用法Q?/span>
<?php
ignore_user_abort();
?>
Source: http://www.php.net/manual/en/function.ignore-user-abort.php
highlight_string()
当你xPHP代码昄到页面上Ӟhighlight_string()函数׃昑־非常有用。这个函C把你提供的PHP代码用内|的PHP语法H出昄定义的颜色高亮显C。这个函数有两个参数Q第一个参数是一个字W串Q表C个字W串需要被H出昄。第二个参数如果讄成TRUEQ这个函数就会把高亮后的代码当成q回D回?/span>
用法
<?php
highlight_string(?<?php phpinfo(); ?>?;
?>
Source: http://php.net/manual/en/function.highlight-string.php
highlight_file
q是一个非常有用的PHP函数Q它能返回指定的PHP文gQƈ按照语法语义用高亮颜色突出显C文件内宏V其中的H出昄的代码都是用HTML标记处理q的?/span>
用法Q?/span>
<?php
highlight_file(“php_script.php?;
?>
Source: http://www.php.net/manual/en/function.highlight-file.php
php_strip_whitespace
q个函数也跟前面的show_source()函数怼Q但它会删除文g里的注释和空格符?/span>
用法Q?/span>
<?php
echo php_strip_whitespace(“php_script.php?;
?>
Source: http://www.php.net/manual/en/function.php-strip-whitespace.php
get_browser
q个函数会读取browscap.ini文gQ返回浏览器兼容信息?/span>
用法Q?/span>
<?php
echo $_SERVER['HTTP_USER_AGENT'];
$browser = get_browser();
print_r($browser);
?>
Source: http://www.php.net/manual/en/function.get-browser.php
memory_get_usage(),memory_get_peak_usage(),getrusage()
q些函数用来获取内存和CPU使用情况Qmemory_get_usage()函数q回内存使用量,memory_get_peak_usage()函数q回内存使用峰|getrusage()q回CUP使用情况Q在调试PHP代码性能Ӟq些函数会给你提供一些有用信息。但有一点请注意Q在q些函数中Window上无效?/span>
用法Q?/span>
<?php
echo “Initial: ?memory_get_usage().?bytes \n?
echo “Peak: ?memory_get_peak_usage().?bytes \n?
$data = getrusage();
echo “User time: ?
($data['ru_utime.tv_sec'] +
$data['ru_utime.tv_usec'] / 1000000);
echo “System time: ?
($data['ru_stime.tv_sec'] +
$data['ru_stime.tv_usec'] / 1000000);
?>
gzcompress(), gzuncompress()
q两个函数用来压~和解压字符串数据。它们的压羃率能辑ֈ50% 左右。另外的函数 gzencode() ?gzdecode() 也能辑ֈcMl果Q但使用了不同的压羃法?/span>
用法Q?/span>
<?php
$string =
“Lorem ipsum dolor sit amet, consectetur
adipiscing elit. Nunc ut elit id mi ultricies
adipiscing. Nulla facilisi. Praesent pulvinar,
sapien vel feugiat vestibulum, nulla dui pretium orci,
non ultricies elit lacus quis ante. Lorem ipsum dolor
sit amet, consectetur adipiscing elit. Aliquam
pretium ullamcorper urna quis iaculis. Etiam ac massa
sed turpis tempor luctus. Curabitur sed nibh eu elit
mollis congue. Praesent ipsum diam, consectetur vitae
ornare a, aliquam a nunc. In id magna pellentesque
tellus posuere adipiscing. Sed non mi metus, at lacinia
augue. Sed magna nisi, ornare in mollis in, mollis
sed nunc. Etiam at justo in leo congue mollis.
Nullam in neque eget metus hendrerit scelerisque
eu non enim. Ut malesuada lacus eu nulla bibendum
id euismod urna sodales. ?
$compressed = gzcompress($string);
$original = gzuncompress($compressed);
?>
你是否也惛_了还有其它很有用的函敎ͼ请在评论里分享出来!