Description of phpin_array and in_array functions

The in_array function is used to check whether an array of values exists. it is used to determine whether a specified value exists in the current array. In_array
(PHP 4, PHP 5)

In_array-check whether a value exists in the array

Description

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 ()

The second condition fails, because in_array () is case sensitive, so the above program is shown:
Got Irix

Example #2 in_array () strict type check Example

The above example will output:

1.13 found with strict check

Example #3 in_array () using arrays as needle

The above example will output:

'Ph 'was found
'O' was found

Note:

Suppose:

Declare an array as follows:

$ Arr = array (*);

Then there are:

In_array (0, $ arr) = true

Confusing! {Weak language}

Solution:
In_array (strval (0), $ arr, true ))

For more information about the use of php in_array functions and in_array functions, see The PHP Chinese website!