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<?php $value = "Ceci n'est pas une URL."; $valid = TRUE; if (in_array(parse_url($value, PHP_URL_SCHEME), [NULL, FALSE], TRUE)) { $valid = FALSE; } var_dump($valid);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.13
bool(false)

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54.98 ms | 406 KiB | 5 Q