Determines whether a number is a function in a known array.

Boolin_array (mixedneedle, arrayhaystack [, boolstrict]) searches for needle in haystack. If yes, TRUE is returned. otherwise, FALSE is returned. If the value of the third parameter strict is TRUE, the in_array () function checks whether the needle type is consistent with h bool in_array (mixed needle, array haystack [, bool strict]).


Search for needle in haystack. If yes, TRUE is returned. otherwise, FALSE is returned.

If the value of the third strict parameter is TRUE, the in_array () function checks whether the needle type is the same as that in haystack.

Note: If needle is a string, the comparison is case sensitive.

Note: Before PHP version 4.2.0, needle cannot be an array.

Example 1. in_array () example

$ OS = array ("Mac", "NT", "Irix", "Linux ");
If (in_array ("Irix", $ OS )){
Print "Got Irix ";
}
If (in_array ("mac", $ OS )){
Print "Got mac ";
}