PHP Common array functions (1)

1. Array_fill (Index,number,value) fills an array with values

Parameter description:

Index: The first index value of the returned array

Number: Specifies how many elements to insert

Value: The values used to populate the array

<?php$a1=array_fill (3,4, "blue");p Rint_r ($a 1);? >

Operation Result:

Array ([3] = blue [4] = blue [5] = = Blue [6] = blue)

2, Array_combine ($keys, $values) merging arrays

Parameter description:

$keys: Key an array group

$values: Array of key values

<?php$fname=array ("Bill", "Steve", "Mark"), $age =array ("" "," "" "]," "" "), $c =array_combine ($fname, $age);p Rint_r ($ c);? >

Operation Result:

Array ([Bill] [Steve] = [Mark] + 31)

3, Array_intersect_key ($arr 1, $arr 2, $arr 3 ...) Compares the key names of two or more arrays, returning the intersection

<?php$a1=array ("A" and "Red", "b" = "green", "c" = "blue"), $a 2=array ("a" and "Red", "c" = "Blue", "d" = > "Pink"); $result =array_intersect_key ($a 1, $a 2);p Rint_r ($result);? >

return Result:

Array ([A] = red [c] = blue)

4. Array_shift ($arr) deletes the first element in the array and returns the deleted element

<?php$a=array ("A" and "Red", "b" = "green", "C" and "Blue"); Echo array_shift ($a);p rint_r ($a);? >

return Result:

Redarray ([b] = green [c] = blue)

5, Array_walk ($arr, function ($value, $key) {}) functions apply a callback function to each element in the array

Changing the values in the array requires a reference type & $value

<?phpfunction myfunction (& $value, $key) {$value = "yellow";} $a =array ("a" and "Red", "b" = "green", "c" = "blue"), Array_walk ($a, "myfunction");p Rint_r ($a); >

return Result:

Array ([A] = yellow [b] = yellow [c] = yellow)

PHP Common array functions (1)