array_intersect()- helps in finding the common elements in two arrays

Definition and Usage

The array_intersect() function compares two or more arrays, and returns an array with the keys and values from the first array, only if the value is present in all of the other arrays.

Syntax

array_intersect(array1,array2,array3...)

Parameter	Description
array1	Required. The first array is the array that the others will be compared with
array2	Required. An array to be compared with the first array
array3	Optional. An array to be compared with the first array

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Tips and Notes

Tip: You can compare the first array with one array, or as many as you like.

Note: Only the value is used in the comparison.

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Example

<?php $a1=array(0=>"Cat",1=>"Dog",2=>"Horse"); $a2=array(3=>"Horse",4=>"Dog",5=>"Fish"); print_r(array_intersect($a1,$a2)); ?>

The output of the code above will be:

Array ( [1] => Dog [2] => Horse )

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array_fill()

Definition and Usage

The array_fill() function returns an array filled with the values you describe.

Syntax

array_fill(start,number,value)

Parameter	Description
start	Required. A numeric value, specifies the starting index of the key
number	Required. A numeric value, specifies the number of entries
value	Required. Specifies the value to be inserted

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Example

<?php $a=array_fill(2,3,"Dog"); print_r($a); ?>

The output of the code above will be:

Array ( [2] => Dog [3] => Dog [4] => Dog )