How to delete an element in an array in PHP

Method: 1. In the foreach loop, find the specified element; then use unset() to delete the element. 2. Use array_search() to find the specified element, and use unset() to delete the element. 3. Use array_search() to find the element, and use array_splice() to delete the element.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Method 1: Using foreach and unset () function deletes a specified element in the array

foreach($array as $k=>$v){
if($v == 'day'){
unset($array[$k]):
}
}

In the foreach loop, find the array element; then use the unset() function to delete the specified array value.

Method 2: Use the array_search() and unset() functions to delete a specified element in the array

if(($key = array_search('day',$arr))){
unset($arr[$key]);
}

array_search() function to find a key value in the array . If the value is found, the key of the matching element is returned. If not found, returns false.

Then use the unset() function to delete the specified array value.

Method 3: Use array_search() and array_splice() functions to delete a specified element in the array

array_splice() function can be used with the unset() function Same effect

if(($key = array_search('day',$arr))){
array_splice($arr, $key,1);
}

array_splice() function removes the selected element from an array and replaces it with a new element. This function will also return the array containing the removed elements. Syntax:

array_splice(array,start,length,array)

array_splice() has four parameters:

Parameter	Description
array	Required. Specifies an array.
start	Required. numerical value. Specifies the starting position of deleted elements. 0 = first element. If the value is set to a positive number, removal starts from the offset specified by the value in the array. If the value is set to a negative number, removal starts from the offset specified by the value from the end of the array. -2 means start from the second to last element of the array.
length	Optional. numerical value. Specifies the number of elements to be removed, which is also the length of the returned array. If the value is set to a positive number, remove that number of elements. If the value is set to a negative number, all elements from start to the reciprocal length of the end of the array are removed. If this value is not set, all elements starting from the position set by the start parameter to the end of the array are removed.
array	Optional. Specifies the array with the elements to be inserted into the original array. If there is only one element, it can be set to a string and does not need to be set to an array.

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