[PHP 4, PHP 5, PHP 7, PHP 8]
in_array — Checks if a value exists in an array
Description
in_array[mixed $needle, array $haystack,
bool $strict = false]: bool
Parameters
needleThe searched value.
Note:
If
needleis a string, the comparison is done in a case-sensitive manner.
haystackThe array.
strict If the third parameter strict is set to
true then the in_array[] function will also check the types of the needle in the haystack.
Note:
Prior to PHP 8.0.0, a
stringneedlewill match an array value of0in non-strict mode, and vice versa. That may lead to undesireable results. Similar edge cases exist for other types, as well. If not absolutely certain of the types of values involved, always use thestrictflag to avoid unexpected behavior.
Return Values
Returns true if needle is found in the array, false otherwise.
Examples
Example #1 in_array[] example
The second condition fails because in_array[] is case-sensitive, so the program above will display:
Example #2 in_array[] with strict example