Delete array element with value php

Содержание

array_pop
Список параметров
Возвращаемые значения
Примеры
Смотрите также
User Contributed Notes 11 notes
How to Delete or Remove Array Element By Value in PHP
Method 1: Using unset() to Remove Array Element By Value in PHP
Method 2: Using array_splice() to Delete an Element From an Array in PHP
Perform Array Delete by Value Not Key in PHP
Use the array_search() and unset() Function to Perform Array Delete by Value Not Key in PHP
Syntax of array_search()
Syntax of unset()
Example of Removing Values From an Array in PHP
Use the array_diff() Function to Perform Array Delete by Value Not Key in PHP
Syntax
Related Article — PHP Array
Delete array element with value php

array_pop

array_pop() извлекает и возвращает значение последнего элемента массива array , уменьшая размер array на один элемент.

Замечание: Эта функция при вызове сбрасывает указатель массива, переданного параметром.

Список параметров

Массив, из которого берётся значение.

Возвращаемые значения

Возвращает значение последнего элемента массива array . Если array пуст, будет возвращён null .

Примеры

Пример #1 Пример использования array_pop()

$stack = array( «orange» , «banana» , «apple» , «raspberry» );
$fruit = array_pop ( $stack );
print_r ( $stack );
?>

После этого в $stack будет только 3 элемента:

Array ( [0] => orange [1] => banana [2] => apple )

и raspberry будет присвоено переменной $fruit .

Смотрите также

array_push() — Добавляет один или несколько элементов в конец массива
array_shift() — Извлекает первый элемент массива
array_unshift() — Добавляет один или несколько элементов в начало массива

User Contributed Notes 11 notes

Notice:
the complexity of array_pop() is O(1).
the complexity of array_shift() is O(n).
array_shift() requires a re-index process on the array, so it has to run over all the elements and index them.

Note that array_pop doesn’t issue ANY warning or error if the array is already empty when you try to pop something from it. This is bizarre! And it will cause cascades of errors that are hard to resolve without knowing the real cause.

Rather than an error, it silently returns a NULL object, it appears, so in my case I ended up with warnings elsewhere about accessing elements of arrays with invalid indexes, as I was expecting to have popped an array. This behaviour (and the lack of any warning, when many trivial things are complained about verbosely) is NOT noted in the manual above. Popping an already empty stack should definitely trigger some sort of notice, to help debugging.

Sure, it’s probably good practice to wrap the pop in an if (count($array)) but that should be suggested in the manual, if there’s no error returned for trying something that should fail and obviously isn’t expected to return a meaningful result.

I wrote a simple function to perform an intersect on multiple (unlimited) arrays.

Pass an array containing all the arrays you want to compare, along with what key to match by.

function multipleArrayIntersect ( $arrayOfArrays , $matchKey )
<
$compareArray = array_pop ( $arrayOfArrays );

foreach( $compareArray AS $key => $valueArray ) <
foreach( $arrayOfArrays AS $subArray => $contents ) <
if (! in_array ( $compareArray [ $key ][ $matchKey ], $contents )) <
unset( $compareArray [ $key ]);
>
>
>

In a previous example .
function array_trim ( $array , $index ) if ( is_array ( $array ) ) unset ( $array [ $index ] );
array_unshift ( $array , array_shift ( $array ) );
return $array ;
>
else return false ;
>
>
?>

This have a problem. if u unset the last value and then use
array_unshift ( $array, array_shift ( $array ) );
?>

will return a : Array ( [0] => )
so u can fix it using.

if ( count ( $array ) > 0 ) array_unshift ( $values , array_shift ( $values ) );
?>

good luck 😉

alex.chacon@terra.com
Hi
Here there is a function that delete a elemente from a array and re calculate indexes

function eliminarElementoArreglo ( $array , $indice )
<
if ( array_key_exists ( $indice , $array ))
<
$temp = $array [ 0 ];
$array [ 0 ] = $array [ $indice ];
$array [ $indice ] = $temp ;
array_shift ( $array );

//reacomodamos ?ndices
for ( $i = 0 ; $i < $indice ; $i ++)
<
$dummy = $array [ $i ];
$array [ $i ] = $temp ;
$temp = $dummy ;
>
>
return $array ;
>
?>

I had a problem when using this function because my array was made up entirley of numbers, so I have made my own function. Hopefully it will be useful to somebody.

Источник

How to Delete or Remove Array Element By Value in PHP

In this tutorial, learn how to delete or remove array element by value using PHP. The short answer is to use the unset() function of PHP that takes array variable with key as an argument.

You can also use the array_splice() method to remove the specified element from an array in PHP. Let’s find out different methods with examples given below here.

Method 1: Using unset() to Remove Array Element By Value in PHP

To remove the given element from an array by value, you have to first find the index of the element or the key. You can identify the index or key of the element using the array_search() as given below. After that, you have to use the unset() function to remove the specified element from an array.

Array ( [0] => Cycle [2] => Car [3] => Bolero )

The above example shows the output that is an array with the element “Bike” remove from it. The resulted array is not in the proper sequence of indexing. You can use the next method to make the array in proper sequence.

Method 2: Using array_splice() to Delete an Element From an Array in PHP

When you want to delete an element from an array, you can use the array_splice() that also gives a proper sequence of indexing in the output. Firstly, you have to find the index or key of the given element using the array_search() . After that, you can use the array_splice() function given below to delete an element from an array.

The array_splice() function takes three arguments to pass. The first argument is the array variable. The second argument is the key that is the result of array_search() function. The third argument of the function specifies the number of elements you want to delete from an array. As you have to delete only a single given element from an array. That’s why the third argument is 1.

Источник

Perform Array Delete by Value Not Key in PHP

Use the array_search() and unset() Function to Perform Array Delete by Value Not Key in PHP
Use the array_diff() Function to Perform Array Delete by Value Not Key in PHP

This article will introduce different methods to remove value from an array in PHP.

Use the array_search() and unset() Function to Perform Array Delete by Value Not Key in PHP

The main procedure to perform array delete by value, but not a key, is to find the value first. We could delete the value after it is found. We will find the value using array_search() function and delete it using unset() function. The unset() functions resets a variable. The correct syntax to use these functions is as follows.

Syntax of array_search()

array_search($value, $array, $strict);

The built-in function array_search() has three parameters. The details of its parameters are as follows

This function returns the key of the given value.

Syntax of unset()

unset($variable1, $variable2, . , $variableN);

The built-in function unset() has multiple parameters. The details of its parameters are as follows

This function returns nothing.

Example of Removing Values From an Array in PHP

The program below shows how we can use these functions to perform array delete by value, but not key, in PHP.

php $array = array("Rose","Lili","Jasmine","Hibiscus","Daffodil","Daisy"); echo("Array before deletion: \n"); var_dump($array); $value = "Jasmine"; if (($key = array_search($value, $array)) !== false)   unset($array[$key]); > echo("Array after deletion: \n"); var_dump($array); ?>

Array before deletion: array(6)   [0]=>  string(4) "Rose"  [1]=>  string(4) "Lili"  [2]=>  string(7) "Jasmine"  [3]=>  string(8) "Hibiscus"  [4]=>  string(8) "Daffodil"  [5]=>  string(5) "Daisy" > Array after deletion: array(5)   [0]=>  string(4) "Rose"  [1]=>  string(4) "Lili"  [3]=>  string(8) "Hibiscus"  [4]=>  string(8) "Daffodil"  [5]=>  string(5) "Daisy" >

Use the array_diff() Function to Perform Array Delete by Value Not Key in PHP

In PHP, we can also use the array_diff() function to perform array delete by value not key. This function computes the difference of a given array with another array. The correct syntax to use this function is as follows.

Syntax

array_diff($array, $Arr1, $Arr2, . ,$ArrN);

The program that performs array delete by value, but not key, is as follows.

php $array = array("Rose","Lili","Jasmine","Hibiscus","Daffodil","Daisy"); echo("Array before deletion: \n"); var_dump($array); $value = array("Jasmine"); $array = array_diff( $array, $value); echo("Array after deletion: \n"); var_dump($array); ?>

Array before deletion: array(6)   [0]=>  string(4) "Rose"  [1]=>  string(4) "Lili"  [2]=>  string(7) "Jasmine"  [3]=>  string(8) "Hibiscus"  [4]=>  string(8) "Daffodil"  [5]=>  string(5) "Daisy" > Array after deletion: array(5)   [0]=>  string(4) "Rose"  [1]=>  string(4) "Lili"  [3]=>  string(8) "Hibiscus"  [4]=>  string(8) "Daffodil"  [5]=>  string(5) "Daisy" >

Источник