Php 想要检测多个URL时，preg_match不起作用

我想自动检测字符串中的任何链接，并用

[链接索引]

替换它们。例如，如果我有一个字符串，如

testhttps://www.google.com/ 嗯http://stackoverflow.com/

结果将是测试[0]毫米小时[1]

现在我试着用这个

$reg_exUrl = '/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i';
if(preg_match($reg_exUrl, $_POST['commento'], $url)) {
    for ($i = 0; $i < count($url); $i++) { 
        $_POST['commento'] = preg_replace($reg_exUrl, "[" . $i . "]", $_POST['commento']);
    }
}

$reg|u exUrl='/\b（？：（？：https？| ftp）：\/\/\/\/\/\ www\.）[-a-z0-9+&\/%？=~！：，.；]*[-a-z0-9+&\/%=~/i'；
if（preg_match（$reg_exUrl，$_POST['commento']，$url））{
对于（$i=0；$i

---

但是我一直得到

test[0]mmh[0]

，如果我尝试

var\u转储（count（$url））

结果总是得到1。如何修复此问题？

因此，更好的解决方案是将传入字符串拆分为每个

url

段之间的字符串数组，然后在连续的非url组件之间插入

[$i]

# better solution, perform a split.
function process_line2($input) {
    $regex_url = '/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i';
    # split the incoming string into an array of non-url segments
    # preg_split does not trim leading or trailing empty segments
    $non_url_segments = preg_split($regex_url, $input, -1);

    # inside the array, combine each successive non-url segment
    # with the next index
    $out = [];
    $count = count($non_url_segments);
    for ($i = 0; $i < $count; $i++) {
        # add the segment
        array_push($out, $non_url_segments[$i]);
        # add its index surrounded by brackets on all segments but the last one
        if ($i < $count -1) {
            array_push($out, '[' . $i . ']');
        }
    }
    # join strings with no whitespace
    return implode('', $out);
}

下面是一个合并了修复程序的示例

<?php 

# original function
function process_line($input) {

    $reg_exUrl = '/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i';
    if(preg_match($reg_exUrl, $input, $url)) {
        for ($i = 0; $i < count($url); $i++) { 
            $input = preg_replace($reg_exUrl, "[" . $i . "]", $input);
        }
    }

    return $input;

}

# function with fixes incorporated
function process_line1($input) {

    $reg_exUrl = '/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i';
    if(preg_match_all($reg_exUrl, $input, $url)) {
        $url_matches = $url[0];
        for ($i = 0; $i < count($url_matches); $i++) { 
            echo $i;
            # add explicit limit of 1 to arguments of preg_replace
            $input = preg_replace($reg_exUrl, "[" . $i . "]", $input, 1);
        }
    }

    return $input;

}

$input = "test https://www.google.com/ mmh http://stackoverflow.com/";

$input = process_line1($input);

echo $input;

?>

<?php 

# original function
function process_line($input) {

    $reg_exUrl = '/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i';
    if(preg_match($reg_exUrl, $input, $url)) {
        for ($i = 0; $i < count($url); $i++) { 
            $input = preg_replace($reg_exUrl, "[" . $i . "]", $input);
        }
    }

    return $input;

}

# function with fixes incorporated
function process_line1($input) {

    $reg_exUrl = '/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i';
    if(preg_match_all($reg_exUrl, $input, $url)) {
        $url_matches = $url[0];
        for ($i = 0; $i < count($url_matches); $i++) { 
            echo $i;
            # add explicit limit of 1 to arguments of preg_replace
            $input = preg_replace($reg_exUrl, "[" . $i . "]", $input, 1);
        }
    }

    return $input;

}

$input = "test https://www.google.com/ mmh http://stackoverflow.com/";

$input = process_line1($input);

echo $input;

?>