php поместить в начало массива

array_unshift

(PHP 4, PHP 5, PHP 7, PHP 8)

array_unshift — Добавляет один или несколько элементов в начало массива

Описание

Список параметров

Значения для добавления.

Возвращаемые значения

Список изменений

Примеры

Пример #1 Пример использования array_unshift()

Результат выполнения данного примера:

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User Contributed Notes 12 notes

You can preserve keys and unshift an array with numerical indexes in a really simple way if you’ll do the following:

array(
100=>’Test Element 1 ‘,
255=>’Test Element 2′
224=>’someword1′,
228=>’someword2′,
102=>’someword3′,
544=>’someword3′,
95=>’someword4′
);

array_merge() will also reindex (see array_merge() manual entry), but the ‘+’ operator won’t, so.

Sahn’s example almost works but has a small error. Try it like this if you need to prepend something to the array without the keys being reindexed and/or need to prepend a key value pair, you can use this short function:

Anonymous’ associative version wasn’t working for me, but it did with this small tweak:

Another way to tack something to the beginning of an array is with array_merge().

$plans = array(‘AARP’=>’Senior’, ‘AAA’=>’Automobile Club’);

Actually this problem with the keys getting reindexed only happens when the keys are numerical:

k: f v: five
k: s v: six
k: t v: twenty
Array
(
[0] => zero
[f] => five
[s] => six
[t] => twenty
)

k: 0 v: zero
k: f v: five
k: s v: six
k: t v: twenty

This becomes a nice little problem if you index your arrays out of order (while manually sorting). For example:

[ 3 ] = ‘8/%/2006’ ;
$recordMonths [ 4 ] = ‘7/%/2004’ ;
$recordMonths [ 0 ] = ‘3/%/2007’ ;
$recordMonths [ 1 ] = ‘2/%/2007’ ;
$recordMonths [ 5 ] = ’12/%/2000′ ;
$recordMonths [ 6 ] = ’11/%/2000′ ;
$recordMonths [ 7 ] = ’10/%/2000′ ;
$recordMonths [ 2 ] = ‘1/%/2007’ ;

singleMonth: 3/%/2007
singleMonth: 2/%/2007
singleMonth: 1/%/2007
singleMonth: 8/%/2006
singleMonth: 7/%/2004
singleMonth: 12/%/2000
singleMonth: 11/%/2000
singleMonth: 10/%/2000
singleMonth: %
singleMonth: 8/%/2006
singleMonth: 7/%/2004
singleMonth: 3/%/2007
singleMonth: 2/%/2007
singleMonth: 12/%/2000
singleMonth: 11/%/2000
singleMonth: 10/%/2000
singleMonth: 1/%/2007

It reindexes them based on the order they were created. It seems like if an array has all numeric indexes, then it should reindex them based on the order of their index. Just my opinion.

If you need to prepend something to the array without the keys being reindexed and/or need to prepend a key value pair, you can use this short function:

If you need to change the name of a key without changing its position in the array this function may be useful.

I had a need tonight to convert a numeric array from 1-based to 0-based, and found that the following worked just fine due to the «side effect» of renumbering:

Last version of PHP deprecated unshifting of a reference.
You can use this function instead :

Источник

array_unshift

array_unshift — Добавить один или несколько элементов в начало массива

Описание

Пример #1 Пример использования array_unshift()

Коментарии

If you need to prepend something to the array without the keys being reindexed and/or need to prepend a key value pair, you can use this short function:

Actually this problem with the keys getting reindexed only happens when the keys are numerical:

k: f v: five
k: s v: six
k: t v: twenty
Array
(
[0] => zero
[f] => five
[s] => six
[t] => twenty
)

k: 0 v: zero
k: f v: five
k: s v: six
k: t v: twenty

array_merge() will also reindex (see array_merge() manual entry), but the ‘+’ operator won’t, so.

If you need to change the name of a key without changing its position in the array this function may be useful.

Last version of PHP deprecated unshifting of a reference.
You can use this function instead :

I had a need tonight to convert a numeric array from 1-based to 0-based, and found that the following worked just fine due to the «side effect» of renumbering:

This becomes a nice little problem if you index your arrays out of order (while manually sorting). For example:

[ 3 ] = ‘8/%/2006’ ;
$recordMonths [ 4 ] = ‘7/%/2004’ ;
$recordMonths [ 0 ] = ‘3/%/2007’ ;
$recordMonths [ 1 ] = ‘2/%/2007’ ;
$recordMonths [ 5 ] = ’12/%/2000′ ;
$recordMonths [ 6 ] = ’11/%/2000′ ;
$recordMonths [ 7 ] = ’10/%/2000′ ;
$recordMonths [ 2 ] = ‘1/%/2007’ ;

singleMonth: 3/%/2007
singleMonth: 2/%/2007
singleMonth: 1/%/2007
singleMonth: 8/%/2006
singleMonth: 7/%/2004
singleMonth: 12/%/2000
singleMonth: 11/%/2000
singleMonth: 10/%/2000
singleMonth: %
singleMonth: 8/%/2006
singleMonth: 7/%/2004
singleMonth: 3/%/2007
singleMonth: 2/%/2007
singleMonth: 12/%/2000
singleMonth: 11/%/2000
singleMonth: 10/%/2000
singleMonth: 1/%/2007

It reindexes them based on the order they were created. It seems like if an array has all numeric indexes, then it should reindex them based on the order of their index. Just my opinion.

You can preserve keys and unshift an array with numerical indexes in a really simple way if you’ll do the following:

array(
100=>’Test Element 1 ‘,
255=>’Test Element 2′
224=>’someword1′,
228=>’someword2′,
102=>’someword3′,
544=>’someword3′,
95=>’someword4′
);

Sahn’s example almost works but has a small error. Try it like this if you need to prepend something to the array without the keys being reindexed and/or need to prepend a key value pair, you can use this short function:

Anonymous’ associative version wasn’t working for me, but it did with this small tweak:

Another way to tack something to the beginning of an array is with array_merge().

$plans = array(‘AARP’=>’Senior’, ‘AAA’=>’Automobile Club’);

Источник

array_push

(PHP 4, PHP 5, PHP 7, PHP 8)

array_push — Добавляет один или несколько элементов в конец массива

Описание

Список параметров

Возвращаемые значения

Возвращает новое количество элементов в массиве.

Список изменений

Примеры

Пример #1 Пример использования array_push()

Результат выполнения данного примера:

Смотрите также

User Contributed Notes 35 notes

If you’re going to use array_push() to insert a «$key» => «$value» pair into an array, it can be done using the following:

It is not necessary to use array_push.

Hope this helps someone.

Rodrigo de Aquino asserted that instead of using array_push to append to an associative array you can instead just do.

. but this is actually not true. Unlike array_push and even.

. Rodrigo’s suggestion is NOT guaranteed to append the new element to the END of the array. For instance.

$data[‘one’] = 1;
$data[‘two’] = 2;
$data[‘three’] = 3;
$data[‘four’] = 4;

. might very well result in an array that looks like this.

[ «four» => 4, «one» => 1, «three» => 3, «two» => 2 ]

I can only assume that PHP sorts the array as elements are added to make it easier for it to find a specified element by its key later. In many cases it won’t matter if the array is not stored internally in the same order you added the elements, but if, for instance, you execute a foreach on the array later, the elements may not be processed in the order you need them to be.

If you want to add elements to the END of an associative array you should use the unary array union operator (+=) instead.

$data[‘one’] = 1;
$data += [ «two» => 2 ];
$data += [ «three» => 3 ];
$data += [ «four» => 4 ];

You can also, of course, append more than one element at once.

$data[‘one’] = 1;
$data += [ «two» => 2, «three» => 3 ];
$data += [ «four» => 4 ];

. which will result in an array that looks like this.

[ «element1» => 1, «element2» => 2, «element3» => 3, «element4» => 4 ]

This is how I add all the elements from one array to another:

If you’re adding multiple values to an array in a loop, it’s faster to use array_push than repeated [] = statements that I see all the time:

$ php5 arraypush.php
X-Powered-By: PHP/5.2.5
Content-type: text/html

Adding 100k elements to array with []

Adding 100k elements to array with array_push

Adding 100k elements to array with [] 10 per iteration

Adding 100k elements to array with array_push 10 per iteration

?>
The above will output this:
Array (
[0] => a
[1] => b
[2] => c
[3] => Array (
[0] => a
[1] => b
[2] => c
)
)

There is a mistake in the note by egingell at sisna dot com 12 years ago. The tow dimensional array will output «d,e,f», not «a,b,c».

Need a real one-liner for adding an element onto a new array name?

Skylifter notes on 20-Jan-2004 that the [] empty bracket notation does not return the array count as array_push does. There’s another difference between array_push and the recommended empty bracket notation.

Empy bracket doesn’t check if a variable is an array first as array_push does. If array_push finds that a variable isn’t an array it prints a Warning message if E_ALL error reporting is on.

So array_push is safer than [], until further this is changed by the PHP developers.

If you want to preserve the keys in the array, use the following:

elegant php array combinations algorithm

A common operation when pushing a value onto a stack is to address the value at the top of the stack.

This can be done easily using the ‘end’ function:

A function which mimics push() from perl, perl lets you push an array to an array: push(@array, @array2, @array3). This function mimics that behaviour.

Add elements to an array before or after a specific index or key:

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Php поместить в начало массива

В этом разделе помещены уроки по PHP скриптам, которые Вы сможете использовать на своих ресурсах.

Фильтрация данных с помощью zend-filter

Когда речь идёт о безопасности веб-сайта, то фраза «фильтруйте всё, экранируйте всё» всегда будет актуальна. Сегодня поговорим о фильтрации данных.

Контекстное экранирование с помощью zend-escaper

Обеспечение безопасности веб-сайта — это не только защита от SQL инъекций, но и протекция от межсайтового скриптинга (XSS), межсайтовой подделки запросов (CSRF) и от других видов атак. В частности, вам нужно очень осторожно подходить к формированию HTML, CSS и JavaScript кода.

Подключение Zend модулей к Expressive

Expressive 2 поддерживает возможность подключения других ZF компонент по специальной схеме. Не всем нравится данное решение. В этой статье мы расскажем как улучшили процесс подключение нескольких модулей.

Совет: отправка информации в Google Analytics через API

Предположим, что вам необходимо отправить какую-то информацию в Google Analytics из серверного скрипта. Как это сделать. Ответ в этой заметке.

Подборка PHP песочниц

Подборка из нескольких видов PHP песочниц. На некоторых вы в режиме online сможете потестить свой код, но есть так же решения, которые можно внедрить на свой сайт.

Совет: активация отображения всех ошибок в PHP

При поднятии PHP проекта на новом рабочем окружении могут возникнуть ошибки отображение которых изначально скрыто базовыми настройками. Это можно исправить, прописав несколько команд.

Агент

PHP парсер юзер агента с поддержкой Laravel, работающий на базе библиотеки Mobile Detect.

Источник

array_shift

(PHP 4, PHP 5, PHP 7, PHP 8)

array_shift — Извлекает первый элемент массива

Описание

array_shift() извлекает первое значение массива array и возвращает его, сокращая размер array на один элемент. Все числовые ключи будут изменены таким образом, что нумерация массива начнётся с нуля, в то время как строковые ключи останутся прежними.

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

Список параметров

Возвращаемые значения

Примеры

Пример #1 Пример использования array_shift()

Результат выполнения данного примера:

Смотрите также

User Contributed Notes 30 notes

Using array_shift over larger array was fairly slow. It sped up as the array shrank, most likely as it has to reindex a smaller data set.

For my purpose, I used array_reverse, then array_pop, which doesn’t need to reindex the array and will preserve keys if you want it to (didn’t matter in my case).

Using direct index references, i.e., array_test[$i], was fast, but direct index referencing + unset for destructive operations was about the same speed as array_reverse and array_pop. It also requires sequential numeric keys.

Just a useful version which returns a simple array with the first key and value. Porbably a better way of doing it, but it works for me 😉

Here is a little function if you would like to get the top element and rotate the array afterwards.

As pointed out earlier, in PHP4, array_shift() modifies the input array by-reference, but it doesn’t return the first element by reference. This may seem like very unexpected behaviour. If you’re working with a collection of references (in my case XML Nodes) this should do the trick.

class ArrayShiftReferenceTest extends UnitTestCase
<

For those that may be trying to use array_shift() with an array containing references (e.g. working with linked node trees), beware that array_shift() may not work as you expect: it will return a *copy* of the first element of the array, and not the element itself, so your reference will be lost.

The solution is to reference the first element before removing it with array_shift():

This function will save the key values of an array, and it will work in lower versions of PHP:

To remove an element from the MIDDLE of an array (similar to array_shift, only instead of removing the first element, we want to remove an element in the middle, and shift all keys that follow down one position)

Note that this only works on enumerated arrays.

//———————————————————-
// The combination of array_shift/array_unshift
// greatly simplified a function I created for
// generating relative paths. Before I found them
// the algorithm was really squirrely, with multiple
// if tests, length calculations, nested loops, etc.
// Great functions.
//———————————————————-

If you want to loop through an array, removing its values one at a time using array_shift() but also want the key as well, try this.

?>

its like foreach but each time the value is removed from the array so it eventually ends up empty

3 Airport in the array

LGW is London Gatwick
LHR is London Heathrow
STN is London Stanstead

0 Airport left in the array

Here’s a utility function to parse command line arguments.

/**
* CommandLine class
*
* @package Framework
*/
/**
* Command Line Interface (CLI) utility class.
*
* @author Patrick Fisher

* @since August 21, 2009
* @package Framework
* @subpackage Env
*/
class CommandLine <

/**
* PARSE ARGUMENTS
*
* [pfisher

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