Commonly used array functions in PHP

This article mainly introduces the commonly used array functions in PHP, which has certain reference value. Now I share it with you. Friends in need can refer to it

1. array_fill(index,number,value ) Fill the array with values

Parameter description:

Index: The first index value of the returned array

Number: Specifies the number of elements to be inserted

　value: The value used to fill the array

<?php
$a1=array_fill(3,4,"blue");
print_r($a1);
?>　

Run result:

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

2. array_combine($keys,$values) merge array

Parameter description:

$keys: Key name array

$values: Key value array

<?php
$fname=array("Bill","Steve","Mark");
$age=array("60","56","31");

$c=array_combine($fname,$age);
print_r($c);
?>

Run result:

Array ( [Bill] => 60 [Steve] => 56 [Mark] => 31 )

3. array_intersect_key($arr1,$arr2,$arr3...) compares two or more The key names of arrays, return the intersection

<?php
$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"red","c"=>"blue","d"=>"pink");

$result=array_intersect_key($a1,$a2);
print_r($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
$a=array("a"=>"red","b"=>"green","c"=>"blue");
echo array_shift($a);
print_r ($a);
?>

return Result:

redArray ( [b] => green [c] => blue )

5, array_walk($arr,function($value,$key){}) function Apply a callback function to each element in the array

To change the value in the array, you need to use a reference type&$value

<?php
function myfunction(&$value,$key)
{
$value="yellow";
}
$a=array("a"=>"red","b"=>"green","c"=>"blue");
array_walk($a,"myfunction");
print_r($a);
?>

to return the result :

Array ( [a] => yellow [b] => yellow [c] => yellow )

The above is the entire content of this article. I hope it will be helpful to everyone's study. For more related content, please pay attention to the PHP Chinese website!

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