php is string
is_string($var)php check string
// if you want to test content of a string to match a model
//You should use a regex filter with preg_match who returns 1 or 0
// this filter works for most of cases
/* use this regex */ preg_match("/^[a-z ,.'-]+$/i", your_string);
if you want more regex filters you can make yours on 'https://regex101.com/'Copyright © 2021 Codeinu
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