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php array_unshift() function syntax

Function:Used to insert new elements into the array. The values of the new array will be inserted at the beginning of the array.

Syntax:array_unshift(array,value1,value2,value3...)

Parameters:

Parameters Description
array Required. Specifies an array.
value1 Required. Specifies the value to be inserted.
value2 Optional. Specifies the value to be inserted.
value3 Optional. Specifies the value to be inserted.

Explanation:The added elements are added as a whole, and the order of these elements in the array is the same as the order in the parameters. This function returns the number of elements in the array. You can insert one or more values. Numeric key names will start at 0 and increase by 1. String key names will remain unchanged.

php array_unshift() function example

"西门","b"=>"灭绝"); print_r(array_unshift($a,"无忌")); echo "
"; print_r($a); ?>

Run instance»

Click the "Run instance" button to view the online instance

Output:

3 Array ( [0] => 无忌 [a] => 西门 [b] => 灭绝 )


"欧阳克","b"=>"西门"); print_r(array_unshift($a,"peter_zhu")); //返回数组长度 echo "
"; print_r($a); //输出新的数组 ?>

Run Instance»

Click the "Run Instance" button to view the online instance

Output:

3 Array ( [0] => peter_zhu [a] => 欧阳克 [b] => 西门 )