PHP Delete Array element method Summary _php Tutorial

In PHP development, we often encounter to delete the specified content in the array, but the array is a special variable we can not directly use replace replacement, need some way to operate, let me introduce you to the Operation method.

If we know the name of the array element, this is good.

Key name to delete the specified array element in the array

The code is as follows	Copy Code
$barray = Array (' A ' =>1, ' B ' =>2, ' WOD ' =>3, ' C ' =>4, ' abc ' =>5); $del = ' B '; Unset ($barray [$del]);//result is Array ( [A] = 1 [WOD] = 3 [C] = 4 [ABC] = 5 )

If there are multiple arrays to be deleted at the same time, the above approach is not resolved, we can use the Array_diff function to manipulate

Cases

The code is as follows	Copy Code
$a 1=array ("Cat", "Dog", "Horse", ' DFF ', ' dfdf ', ' www '); $a 2=array ("DFF", "Horse", "Dog"); $a 1 = Array_diff ($a 1, $a 2); Sort ($a 1); Print_r ($a 1); Array ( [0] = Cat [1] = DFDF [2] = = www )

Example 2

The Array_search () function, like In_array (), looks for a key value in the array. If the value is found, the key name of the matching element is returned. Returns false if not found

The code is as follows	Copy Code
$array = Array (' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 '); $del _value = 3; Unset ($array [Array_search ($del _value, $array)]);//use unset to delete this element Print_r ($array); Output Array (' 1 ', ' 2 ', ' 4 ', ' 5 ');

Cases

Array_filter ()
Call mode: Array_filter ($array)
Parameter description: $array is the object of the operation, we will delete the empty element in it

Instance:

The code is as follows	Copy Code
$array = (' a ' + = ' abc ', ' B ' + = ' bcd ', ' c ' = ' CDE ', ' d ' and ' Def ', ' e ' = ' = ') '; Array_filter ($array); echo " "; Print_r ($array); ?> Results: Array ( [A] = ABC [B] = BCD [C] = CDE [d] = def )

None of the above-mentioned methods will be rebuilt, so let me show you a way to delete an array element and rebuild the array index.

The code is as follows	Copy Code
Function Array_remove (& $arr, $offset) { Array_splice ($arr, $offset, 1); } $a = Array (' A ', ' B ', ' C ', ' d '); Array_remove ($a, 2); Print_r ($a);

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