PHP compares the key names and key values of two arrays and returns the intersection function array_intersect

PHP compares the key names and key values of two arrays and returns the intersection function array_intersect_uassoc()

黄舟

Release： 2023-03-17 07:54:01

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Example

Compare the key names and key values of two arrays (use user custom function to compare key names), and return the intersection:

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("d"=>"red","b"=>"green","e"=>"blue");

$result=array_intersect_uassoc($a1,$a2,"myfunction");
print_r($result);
?>

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Definition and usage

array_intersect_uassoc() function is used to compare the key names and key values of two (or more) arrays and return the intersection.

Note: This function uses a user-defined function to compare key names!

This function compares the key names and key values of two (or more) arrays, and returns an intersection array, which includes everything in the compared array (array1) and any other The key name and key value in the parameter array (array2 or array3, etc.).

Syntax

array_intersect_uassoc(array1,array2,array3...,myfunction)

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Parameters	Description
array1	Required. The first array to compare with other arrays.
array2	Required. The array to compare to the first array.
array3,...	Optional. Additional array to compare with the first array.
myfunction	Required. A string that defines a callable comparison function. If the first argument is <, =, > and the second argument is, the corresponding comparison function must return an integer of <, =, > 0.

Technical details

Return value:	Returns an intersection array, which contains All keys and values in the array being compared (array1) and in any other parameter arrays (array2 or array3, etc.).
PHP version:	5+

##More examples

Example 1

Compare the key names and key values of the three arrays (use user-defined functions to compare key names), and return the intersection:

<?php
function myfunction($a,$b)
{
if ($a===$b)
{
return 0;
}
return ($a>$b)?1:-1;
}

$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"red","b"=>"green","d"=>"blue");
$a3=array("e"=>"yellow","a"=>"red","d"=>"blue");

$result=array_intersect_uassoc($a1,$a2,$a3,"myfunction");
print_r($result);
?>

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Example:

<?php 
function myfunction($v1,$v2) 
{ if ($v1===$v2) { return 0; } 
if ($v1>$v2) { return 1; } 
else { return -1; 
} 
} 
$a1=array(0=>"Dog",1=>"Cat",2=>"Horse"); 
$a2=array(3=>"Dog",1=>"Cat",5=>"Horse"); 
print_r(array_intersect_uassoc($a1,$a2,"myfunction")); 
?>

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Output:

Array ( [1] => Cat )

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