How to extract text between 2 tags in php

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I need to locate 2 tags in a lump of text and keep whatever text is between them.

For example if the \"Begin\" tag was -----start----- and the \"End\" t

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3条回答

心在旅途

2021-01-07 11:55

Here are a couple of ways:

$lump = 'rtyfbytgyuibg-----start-----isnv4b987b6vdc5y6ughnjmn9b8v76ctyubinn98b76r-----end-----gcgkhjkn';
$start_tag = '-----start-----';
$end_tag = '-----end-----';

// method 1
if (preg_match('/'.preg_quote($start_tag).'(.*?)'.preg_quote($end_tag).'/s', $lump, $matches)) {
    echo $matches[1];
}

// method 2 (faster)
$startpos = strpos($lump, $start_tag) + strlen($start_tag);
if ($startpos !== false) {
    $endpos = strpos($lump, $end_tag, $startpos);
    if ($endpos !== false) {
        echo substr($lump, $startpos, $endpos - $startpos);
    }
}

// method 3 (if you need to find multiple occurrences)
if (preg_match_all('/'.preg_quote($start_tag).'(.*?)'.preg_quote($end_tag).'/s', $lump, $matches)) {
    print_r($matches[1]);
}

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隐瞒了意图╮

2021-01-07 12:05

Try this:

$start = '-----start-----';
$end   = '-----end-----';
$string = 'rtyfbytgyuibg-----start-----isnv4b987b6vdc5y6ughnjmn9b8v76ctyubinn98b76r-----end-----gcgkhjkn';
$output = strstr( substr( $string, strpos( $string, $start) + strlen( $start)), $end, true);
echo $output;

This will print:

isnv4b987b6vdc5y6ughnjmn9b8v76ctyubinn98b76r

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南方客

2021-01-07 12:13

If your string is actually HTML data, you have to add htmlentities($lump) so it won't return empty:

$lump = '<html><head></head><body>rtyfbytgyuibg-----start-----<div>isnv4b987b6vdc5y6ughnjmn9b8v76ctyubinn98b76r</div>-----end-----gcgkhjkn</body></html>';
$lump = htmlentities($lump) //<-- HERE
$start_tag = '-----start-----';
$end_tag = '-----end-----';

// method 1
if (preg_match('/'.preg_quote($start_tag).'(.*?)'.preg_quote($end_tag).'/s', $lump, $matches)) {
        echo $matches[1];
}

// method 2 (faster)
$startpos = strpos($lump, $start_tag) + strlen($start_tag);
if ($startpos !== false) {
   $endpos = strpos($lump, $end_tag, $startpos);
        if ($endpos !== false) {
            echo substr($lump, $startpos, $endpos - $startpos);
        }
}

// method 3 (if you need to find multiple occurrences)
if (preg_match_all('/'.preg_quote($start_tag).'(.*?)'.preg_quote($end_tag).'/s', $lump, $matches)) {
        print_r($matches[1]);
 }

// method 4 
$output = strstr( substr( $string, strpos( $string, $start) + strlen( $start)), $end, true);

//Turn back to regular HTML
echo htmlspecialchars_decode($output);

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