1if(jQuery.inArray("test", myarray) !== -1)
2

1Array(5).fill(2)
2//=> [2, 2, 2, 2, 2]

1$colors = array("red", "blue", "green"); 
2 
3if (in_array("red", $colors)) { 
4	echo "found red in array"; 
5} 

1function isInArray(value, array) {
2return array.indexOf(value) > -1;
3}

1$.inArray( 5 + 5, [ "8", "9", "10", 10 + "" ] );
2

1array.includes(élémentRecherché)
2array.includes(élémentRecherché, indiceDépart)
3