PHP array operation get array element index value _php Tutorial

If we want to get the index value quickly, we can use the PHP array_values () function, which can quickly and concisely help us find what we want. Let's take a look at the use of the Array_values () function

The Array_keys () function returns a new array that contains all the key names in the array.

If the second argument is supplied, only the key name of the value is returned.

If the strict parameter is specified as true, PHP uses the congruent comparison (= = =) to strictly check the data type of the key value.

Grammar
Array_keys (array,value) parameter description
Array required. Specifies the input array.
Value is optional. The index (key) of the specified value.
Strict is optional. Used with the value parameter. Possible values:

True-Returns the key name with the specified value, based on the type.
False-The default value. Does not depend on the type.

Example 1

The code is as follows	Copy Code
$a =array ("a" = "Horse", "b" = "Cat", "C" and "Dog"); Print_r (Array_keys ($a)); ?> Output: Array ([0] = a [1] = b [2] = = c)

Example 2
Use the value parameter:

The code is as follows	Copy Code
$a =array ("a" = "Horse", "b" = "Cat", "C" and "Dog"); Print_r (Array_keys ($a, "Dog")); ?> Output: Array ([0] + = c)

Example 3
Use the strict parameter (false):

The code is as follows	Copy Code
$a =array (10,20,30, "10"); Print_r (Array_keys ($a, "ten", false)); ?> Output: Array ([0] = 0 [1] = 3)

Example 4
Use the strict parameter (true):

The code is as follows	Copy Code
$a =array (10,20,30, "10"); Print_r (Array_keys ($a, "ten", true)); ?> Output: Array ([0] = 3)

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