How to search text for multiple strings in PHP

Question

I have a text string as follows:

$input = "Lorem ipsum dolor sit amet, consectetur adipiscing add_filter('hello_text', 'sample'); elit. Sed vitae magna vel add_filter('goodbye_text', 'sample'); neque tincidunt.";

I need to search the $input string for "add_filter('***'" and get the *** text. If the string contains multiple different *** strings, I need to get them as well and save them to an array.

So the $input string above would generate: array('hello_text','goodbye_text')

I think I can use stripos () but I'm not sure how I would find this text pattern, as the *** text will be different every time.

Use a regular expression?

Barmar
– Barmar

2020-12-15 01:25:55 +00:00
Commented Dec 15, 2020 at 1:25 — Barmar
– Barmar, Commented Dec 15, 2020 at 1:25
I find your minimal reproducible example to be Unclear.

mickmackusa
– mickmackusa ♦

2024-05-29 20:48:57 +00:00
Commented May 29, 2024 at 20:48 — mickmackusa
– mickmackusa ♦, Commented May 29, 2024 at 20:48

C3iG3 · Accepted Answer · 2020-12-15 03:24:32Z

2

This is based on dekameron's answer but makes the regular expression more generic.

<?php

$input = "Lorem ipsum dolor sit amet, consectetur adipiscing elit add_filter('hello_text', 'sample'). Sed vitae magna add_filter('goodbye_text', 'sample') vel neque tincidunt.";

preg_match_all( "/add_filter\s*?\(\s*?'(.+?)'/ui", $input, $matches );

print_r($matches[1]);

Hook names are not restricted to just basic characters such as letters, numbers, underscore, etc. (Advanced Custom Fields is one plugin that uses forward slashes in the hook names). This regular expression will handle generic hook names (however, it won't handle escaped single quotes). Additionally, this will handle cases where the spacing between the "add_function", the opening paren, and the hook argument changes.

answered Dec 15, 2020 at 3:24

C3iG3

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3 Comments

harvey Over a year ago

Worked perfectly. Thanks! Also, I didn't realize hook names can have slashes etc. in them! Now I have to learn what that regular expression is doing...

C3iG3 Over a year ago

@harvey, I suggest using regex101.com to test and examine regular expressions, regex101.com/r/NGBWah/1

harvey Over a year ago

Thanks I'll check that out!

dekameron · Accepted Answer · 2020-12-15 02:03:49Z

1

<?php

function find_filters($string)
{
    if (!preg_match_all("|add_filter\('([a-z0-9_]+)'|ui", $string, $matches)) {
        return [];
    }

    return array_unique($matches[1]);
}

$input = "Lorem ipsum dolor sit amet, consectetur adipiscing elit add_filter('hellotext', 'sample'). Sed vitae magna add_filter('goodbye_text', 'sample') vel neque tincidunt.";

$result = find_filters($input);
var_dump($result);

answered Dec 15, 2020 at 2:03

dekameron

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1 Comment

mickmackusa Over a year ago

[a-z0-9_] with an i modifier is more simply written as \w.

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