PHP 处理字符串的代码片段

移除html 标签：$text = strip_tags($input, "");

返回 $start 和 $end 之间的文本

function GetBetween($content,$start,$end){    $r = explode($start, $content);    if (isset($r[1])){        $r = explode($end, $r[1]);        return $r[0];    }    return '';}

将字符串中的url 转换成链接:

$url = "Jean-Baptiste Jung (http://www.webdevcat.com)";$url = preg_replace("#http://([A-z0-9./-]+)#", '<a href="http://www.catswhocode.com/blog/$1" style="font-size: 12px; vertical-align: baseline; background-color: transparent; margin: 0px; padding: 0px; color: #3777af; text-decoration: none; font-weight: bold">$0</a>', $url);

删除字符串中的URL:

$string = preg_replace('/\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|$!:,.;]*[A-Z0-9+&@#\/%=~_|$]/i', '', $string);

解析CSV文件：

$fh = fopen("contacts.csv", "r");while($line = fgetcsv($fh, 1000, ",")) {    echo "Contact: {$line[1]}";}

字符串搜索：

function contains($str, $content, $ignorecase=true){    if ($ignorecase){        $str = strtolower($str);        $content = strtolower($content);    }    return strpos($content,$str) ? true : false;}

从字符串中提取 email 地址：

function extract_emails($str){    // This regular expression extracts all emails from a string:    $regexp = '/([a-z0-9_\.\-])+\@(([a-z0-9\-])+\.)+([a-z0-9]{2,4})+/i';    preg_match_all($regexp, $str, $m);    return isset($m[0]) ? $m[0] : array();}$test_string = 'This is a test string...        [e-mail]        Test different formats:        [e-mail];        <a href="[e-mail]">foobar</a>        <[e-mail]>        strange formats:        [e-mail]        test6[at]example.org        [e-mail]        test8@ example.org        test9@!foo!.org        foobar';print_r(extract_emails($test_string));