常用字符串处理代码片段

　　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url转换成链接

$url = "Jean-Baptiste Jung (http://www.webdevcat.com)"; 
$url = preg_replace("#http://([A-z0-9./-]+)#", '$0', $url); 

　　切分字符串为140个字符

function split_to_chunks($to,$text){ 
    $total_length = (140 - strlen($to)); 
    $text_arr = explode(" ",$text); 
    $i=0; 
    $message[0]=""; 
    foreach ($text_arr as $word){ 
        if ( strlen($message[$i] . $word . ' ') $total_length ){ 
            if ($text_arr[count($text_arr)-1] == $word){ 
                $message[$i] .= $word; 
            } else { 
                $message[$i] .= $word . ' '; 
            } 
        } else { 
            $i++; 
            if ($text_arr[count($text_arr)-1] == $word){ 
                $message[$i] = $word; 
            } else { 
                $message[$i] = $word . ' '; 
            } 
        } 
    } 
    return $message; 
} 

　　删除字符串中的URL

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

　　将字符串转成SEO友好的字符串

function slug($str){ 
    $str = strtolower(trim($str)); 
    $str = preg_replace('/[^a-z0-9-]/', '-', $str); 
    $str = preg_replace('/-+/', "-", $str); 
    return $str; 
} 

　　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; 
} 

　　检查字符串是否以某个串开始

function String_Begins_With($needle, $haystack { 
    return (substr($haystack, 0, strlen($needle))==$needle); 
} 

　　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]; 

        "[e-mail]">foobar