10 个 PHP 关于字符串处理的代码片段

代码片段(11) [全屏查看所有代码]

1. [代码]移除 HTML 标签

$text = strip_tags($input, "");

2. [代码]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 '';
}

3. [代码]将url转换成链接

$url = "Jean-Baptiste Jung (http://www.php.cn/)";
$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);

4. [代码]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;
}

5. [代码]删除字符串中的URL

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

6. [代码]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;
}

7. [代码]解析 CSV 文件

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

8. [代码]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;
}

9. [代码]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);
}

10. [代码]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));

11. [代码][PHP]代码

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));