Check array for partial match (PHP) [duplicate]

问题

This question already has answers here:

Search for partial value match in an Array (3 answers)

Closed 4 years ago.

I have an array of filenames which I need to check against a code, for example

array("120_120_435645.jpg","150_150_312312.jpg","250_250_1232327.jpg");

the string is "312312" so it would match "150_150_312312.jpg" as it contains that string. If there are no matches at all within the search then flag the code as missing.

I tried in_array but this seems to any return true if it is an exact match, don't know if array_filter will do it wither...

Thanks for any advice...perhaps I have been staring at it too long and a coffee may help :)

回答1:

$filenames = array("120_120_435645.jpg","150_150_312312.jpg","250_250_1232327.jpg");
$matches = preg_grep("/312312/", $filenames);
print_r($matches);

Output:

Array
(
    [1] => 150_150_312312.jpg
)

Or, if you don't want to use regex, you can simply use strpos as suggested in this answer:

foreach ($filenames as $filename) {
    if (strpos($filename,'312312') !== false) {
    echo 'True';
    }
}

Demo!

来源：https://stackoverflow.com/questions/18338915/check-array-for-partial-match-php