how to check in PHP if array already contains this value code example

Example 1: in_array in php

in_array ( mixed $needle , array $haystack [, bool $strict = FALSE ] ) : bool
  
// Without strict check
echo in_array("18", $myArr); // TRUE
// With strict check
echo in_array("18", $myArr, true); // FALSE

Example 2: check null in_array php

if (!empty($data_days) && in_array(1, $data_days, true)){ // use numeric value 1, not string

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