PHP Two ways to delete array elements unset,array_splice usage differences

$arr = Array (' A ', ' B ', ' C ', ' d '); Unset ($arr [1]); Print_r ($arr); ?> Copy Code Result: Array ([0] = a [2] = c [3] + D) How does the missing element be filled and the array will be re-indexed? The answer is Array_splice (): Example: $arr = Array (' A ', ' B ', ' C ', ' d '); Array_splice ($arr, 1, 1); Print_r ($arr); ?> Copy Code Result: Array ([0] = a [1] = c [2] + D) Delete the specific element in the array (bbs.it-home.org script Academy): $arr 2 = Array (1, 3, 5,7,8); foreach ($arr 2 as $key = $value) { if ($value = = = 3) unset ($arr 2[$key]); } Var_dump ($arr 2); ?> Copy Code To delete an empty array: $array = (' a ' + = ' abc ', ' B ' + = ' bcd ', ' c ' = ' CDE ', ' d ' and ' Def ', ' e ' = ' = ') '; Array_filter ($array); echo " "; Print_r ($array); ?> Copy Code Result: Array ([a] = ABC + BCD [c] = CDE [d] = def) Summary: If the Array_splice () function is deleted, the index value of the array also changes. If the unset () function is removed, the index value of the array does not change.

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