Php: Remove multiple child tags(script)

Question

Need to find a single <script> condition </script> that contains condition. The example below contains 4 tags, i need to match the second tag that contains condition and discard the others. Starts with <script>. Before the condition could be space or new line, and than the condition like if (window.location.href == bar) { } and than could be space or new line, and the end </script>.

<script>                  <!-- discard --->
other stuff
not to be found
</script>                 


<script>                  <!-- MATCH --->

if (window.location.href == bar) {         
do something                 
}

</script>                

<script>                 <!-- discard --->
other stuff
not to be found
</script>                

<script>                 <!-- discard --->
other stuff
not to be found
</script>

Thanks in advance

I hope you were expecting this result.

Sahil Gulati
– Sahil Gulati

2017-04-30 03:07:14 +00:00
Commented Apr 30, 2017 at 3:07 — Sahil Gulati
– Sahil Gulati, Commented Apr 30, 2017 at 3:07

Sahil Gulati · Accepted Answer · 2017-04-30 02:58:31Z

1

Here you should use DOMDocument instead of Regex for matching tags and its required content.

Try this code snippet here

<?php
ini_set('display_errors', 1);
$object= new DOMDocument();
$object->loadHTML('<html><body><script>                  <!-- discard --->
other stuff
not to be found
</script>                 

<script>                  <!-- MATCH --->

if (window.location.href == bar) {         
do something                 
}

</script>                

<script>                 <!-- discard --->
other stuff
not to be found
</script>                

<script>                 <!-- discard --->
other stuff
not to be found
</script></body></html>');
$tagsToRemove=array();
foreach($object->getElementsByTagName("script") as $element)
{
    if($element instanceof  DOMElement)
    {
        if(!preg_match("/if\s*\(/i", $element->nodeValue))
        {
            $tagsToRemove[]=$element;
        }
    }
}
foreach($tagsToRemove as $element)
{
    $element->parentNode->removeChild($element);
}
echo $object->saveHTML();

answered Apr 30, 2017 at 2:58

Sahil Gulati

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2 Comments

Avel Over a year ago

Actually i'm using cURL to get the html.

Sahil Gulati Over a year ago

@Avel can you share your complete HTML? but i think my above example will work fine for your complete HTML as well

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