4 methods: 1. Use array_keys(), the syntax is "array_keys (array)". 2. Use foreach and an empty array, the syntax is "foreach(original array as $k=>$v){empty array name[]=$k;}". 3. Use array_splice(), the syntax is "array_splice(array, delete position, delete length)". 4. Use array_slice(), the syntax is "array_slice (array, interception position, length)".
The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer
php removes array value Multiple methods of (key values)
Method 1: Use the array_keys() function to remove all values (key values)
array_key() The function can retrieve some or all keys in the array.
Use the array_key() function to remove all key values from the array and return a new array containing all key names.
Method 3: Use the array_splice() function to remove the array value (Key value)
When the array_splice() function deletes a part of the elements of the array, it will form these deleted elements into a new array Usage syntax:
array_splice() function deletes the elements of the array When a part of the elements is removed, the deleted elements will be formed into a new array, and then the new array will be returned; therefore, the array_splice() function can be used to intercept array fragments.
array_splice(array1,start,length,array2)
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Parameters
Description
array1
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 begins at the offset specified by the value in the array. If the value is set to a negative number, removal begins at 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 this value is set to a positive number, remove this number of elements. If this value is set to a negative number, all elements from start to length inverse of the end of the array are removed. If this value is not set, all elements from the position set by the start parameter to the end of the array are removed.
array2
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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