php array_unshift() function

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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:

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); ?>

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 ?>

Output:

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