What is array values in php

Содержание

array_values
Parameters
Return Values
Examples
See Also
array_values
Parameters
Return Values
Examples
See Also
User Contributed Notes 6 notes
What is array values in php
PHP array_values() – Get Values in Array
PHP array_values() Function
Syntax of array_values()
2. Get Values from an Indexed Array
3. Get Values from an Array with Default Index
Conclusion

array_values

array_values () возвращает все значения из array и индексирует массив численно.

Parameters

Return Values

Возвращает индексированный массив значений.

Examples

Пример # 1 array_values () Пример

 $array = array("size" => "XL", "color" => "gold"); print_r(array_values($array)); ?>

Выводится приведенный выше пример:

array_values

array_values() returns all the values from the array and indexes the array numerically.

Parameters

Return Values

Returns an indexed array of values.

Examples

Example #1 array_values() example

The above example will output:

User Contributed Notes 6 notes

Remember, array_values() will ignore your beautiful numeric indexes, it will renumber them according tho the ‘foreach’ ordering:

print_r ( array_values ( $a ));
==>
Array(
[ 0 ] => 11
[ 1 ] => 22
[ 2 ] => 33
[ 3 ] => 44
)
?>

Just a warning that re-indexing an array by array_values() may cause you to reach the memory limit unexpectly.

For example, if your PHP momory_limits is 8MB,
and says there’s a BIG array $bigArray which allocate 5MB of memory.

Doing this will cause PHP exceeds the momory limits:

$bigArray = array_values ( $bigArray );
?>

It’s because array_values() does not re-index $bigArray directly,
it just re-index it into another array, and assign to itself later.

This is another way to get value from a multidimensional array, but for versions of php >= 5.3.x
/**
* Get all values from specific key in a multidimensional array
*
* @param $key string
* @param $arr array
* @return null|string|array
*/
function array_value_recursive ( $key , array $arr ) $val = array();
array_walk_recursive ( $arr , function( $v , $k ) use( $key , & $val ) if( $k == $key ) array_push ( $val , $v );
>);
return count ( $val ) > 1 ? $val : array_pop ( $val );
>

$arr = array(
‘foo’ => ‘foo’ ,
‘bar’ => array(
‘baz’ => ‘baz’ ,
‘candy’ => ‘candy’ ,
‘vegetable’ => array(
‘carrot’ => ‘carrot’ ,
)
),
‘vegetable’ => array(
‘carrot’ => ‘carrot2’ ,
),
‘fruits’ => ‘fruits’ ,
);

var_dump ( array_value_recursive ( ‘carrot’ , $arr )); // array(2) < [0]=>string(6) «carrot» [1]=> string(7) «carrot2» >
var_dump ( array_value_recursive ( ‘apple’ , $arr )); // null
var_dump ( array_value_recursive ( ‘baz’ , $arr )); // string(3) «baz»
var_dump ( array_value_recursive ( ‘candy’ , $arr )); // string(5) «candy»
var_dump ( array_value_recursive ( ‘pear’ , $arr )); // null
?>

Most of the array_flatten functions don’t allow preservation of keys. Mine allows preserve, don’t preserve, and preserve only strings (default).

// recursively reduces deep arrays to single-dimensional arrays
// $preserve_keys: (0=>never, 1=>strings, 2=>always)
function array_flatten($array, $preserve_keys = 1, &$newArray = Array()) foreach ($array as $key => $child) if (is_array($child)) $newArray =& array_flatten($child, $preserve_keys, $newArray);
> elseif ($preserve_keys + is_string($key) > 1) $newArray[$key] = $child;
> else $newArray[] = $child;
>
>
return $newArray;
>

echo ‘var_dump($array);’.»\n»;
var_dump($array);
echo ‘var_dump(array_flatten($array, 0));’.»\n»;
var_dump(array_flatten($array, 0));
echo ‘var_dump(array_flatten($array, 1));’.»\n»;
var_dump(array_flatten($array, 1));
echo ‘var_dump(array_flatten($array, 2));’.»\n»;
var_dump(array_flatten($array, 2));
?>

If you are looking for a way to count the total number of times a specific value appears in array, use this function:

function array_value_count ( $match , $array )
<
$count = 0 ;

foreach ( $array as $key => $value )
<
if ( $value == $match )
<
$count ++;
>
>

return $count ;
>
?>

This should really be a native function of PHP.

/**
flatten an arbitrarily deep multidimensional array
into a list of its scalar values
(may be inefficient for large structures)
(will infinite recurse on self-referential structures)
(could be extended to handle objects)
*/
function array_values_recursive ( $ary )
$lst = array();
foreach( array_keys ( $ary ) as $k ) $v = $ary [ $k ];
if ( is_scalar ( $v )) $lst [] = $v ;
> elseif ( is_array ( $v )) $lst = array_merge ( $lst ,
array_values_recursive ( $v )
);
>
>
return $lst ;
>
?>

code till dawn! -mark meves!

Array Functions
- array_change_key_case
- array_chunk
- array_column
- array_combine
- array_count_values
- array_diff_assoc
- array_diff_key
- array_diff_uassoc
- array_diff_ukey
- array_diff
- array_fill_keys
- array_fill
- array_filter
- array_flip
- array_intersect_assoc
- array_intersect_key
- array_intersect_uassoc
- array_intersect_ukey
- array_intersect
- array_is_list
- array_key_exists
- array_key_first
- array_key_last
- array_keys
- array_map
- array_merge_recursive
- array_merge
- array_multisort
- array_pad
- array_pop
- array_product
- array_push
- array_rand
- array_reduce
- array_replace_recursive
- array_replace
- array_reverse
- array_search
- array_shift
- array_slice
- array_splice
- array_sum
- array_udiff_assoc
- array_udiff_uassoc
- array_udiff
- array_uintersect_assoc
- array_uintersect_uassoc
- array_uintersect
- array_unique
- array_unshift
- array_values
- array_walk_recursive
- array_walk
- array
- arsort
- asort
- compact
- count
- current
- end
- extract
- in_array
- key_exists
- key
- krsort
- ksort
- list
- natcasesort
- natsort
- next
- pos
- prev
- range
- reset
- rsort
- shuffle
- sizeof
- sort
- uasort
- uksort
- usort
- each
Источник

What is array values in php

// Before php 5.4
$array = array(1,2,3);

// since php 5.4 , short syntax
$array = [1,2,3];

// I recommend using the short syntax if you have php version >= 5.4

Used to creating arrays like this in Perl?

Looks like we need the range() function in PHP:

$array = array_merge (array( ‘All’ ), range ( ‘A’ , ‘Z’ ));
?>

You don’t need to array_merge if it’s just one range:

There is another kind of array (php>= 5.3.0) produced by

$array = new SplFixedArray(5);

Standard arrays, as documented here, are marvellously flexible and, due to the underlying hashtable, extremely fast for certain kinds of lookup operation.

Supposing a large string-keyed array

$arr=[‘string1’=>$data1, ‘string2’=>$data2 etc. ]
when getting the keyed data with

php does *not* have to search through the array comparing each key string to the given key (‘string1’) one by one, which could take a long time with a large array. Instead the hashtable means that php takes the given key string and computes from it the memory location of the keyed data, and then instantly retrieves the data. Marvellous! And so quick. And no need to know anything about hashtables as it’s all hidden away.

However, there is a lot of overhead in that. It uses lots of memory, as hashtables tend to (also nearly doubling on a 64bit server), and should be significantly slower for integer keyed arrays than old-fashioned (non-hashtable) integer-keyed arrays. For that see more on SplFixedArray :

Unlike a standard php (hashtabled) array, if you lookup by integer then the integer itself denotes the memory location of the data, no hashtable computation on the integer key needed. This is much quicker. It’s also quicker to build the array compared to the complex operations needed for hashtables. And it uses a lot less memory as there is no hashtable data structure. This is really an optimisation decision, but in some cases of large integer keyed arrays it may significantly reduce server memory and increase performance (including the avoiding of expensive memory deallocation of hashtable arrays at the exiting of the script).

When creating arrays , if we have an element with the same value as another element from the same array, we would expect PHP instead of creating new zval container to increase the refcount and point the duplicate symbol to the same zval. This is true except for value type integer.
Example:

$arr = [‘bebe’ => ‘Bob’, ‘age’ => 23, ‘too’ => 23 ];
xdebug_debug_zval( ‘arr’ );

(refcount=2, is_ref=0)
array (size=3)
‘bebe’ => (refcount=1, is_ref=0)string ‘Bob’ (length=3)
‘age’ => (refcount=0, is_ref=0)int 23
‘too’ => (refcount=0, is_ref=0)int 23

but :
$arr = [‘bebe’ => ‘Bob’, ‘age’ => 23, ‘too’ => ’23’ ];
xdebug_debug_zval( ‘arr’ );

(refcount=2, is_ref=0)
array (size=3)
‘bebe’ => (refcount=1, is_ref=0)string ‘Bob’ (length=3)
‘age’ => (refcount=0, is_ref=0)int 23
‘too’ => (refcount=1, is_ref=0)string ’23’ (length=2)
or :

$arr = [‘bebe’ => ‘Bob’, ‘age’ => [1,2], ‘too’ => [1,2] ];
xdebug_debug_zval( ‘arr’ );

(refcount=2, is_ref=0)
array (size=3)
‘bebe’ => (refcount=1, is_ref=0)string ‘Bob’ (length=3)
‘age’ => (refcount=2, is_ref=0)
array (size=2)
0 => (refcount=0, is_ref=0)int 1
1 => (refcount=0, is_ref=0)int 2
‘too’ => (refcount=2, is_ref=0)
array (size=2)
0 => (refcount=0, is_ref=0)int 1
1 => (refcount=0, is_ref=0)int 2

This function makes (assoc.) array creation much easier:

function arr (. $array )< return $array ; >
?>

It allows for short syntax like:

$arr = arr ( x : 1 , y : 2 , z : 3 );
?>

Instead of:

$arr = [ «x» => 1 , «y» => 2 , «z» => 3 ];
// or
$arr2 = array( «x» => 1 , «y» => 2 , «z» => 3 );
?>

Sadly PHP 8.2 doesn’t support this named arguments in the «array» function/language construct.

Источник

PHP array_values() – Get Values in Array

In this tutorial, you shall learn about PHP array_change_key_case() function which can change the case of all keys in an array, with syntax and examples.

PHP array_values() Function

The PHP array_values() function returns an indexed array with all the values from given array.

In this tutorial, we will learn the syntax of array_values() and how to use it to get values from associative arrays and indexed arrays.

Syntax of array_values()

The syntax of array_values() function is

Please note that the returned array is an indexed array with index starting from 0.

2. Get Values from an Indexed Array

In this example, we will take an indexed array with two items. We will get the values alone form this array using array_values() function. The index is dropped and the values alone are picked.

PHP Program
```
"apple", "banana"); $values = array_values($array1); print_r($array1); echo "
Values array is: 
"; print_r($values); ?>
```
3. Get Values from an Array with Default Index

If you provide an array with default index, then the result of array_values() function is also same as the of the given input array.

PHP Program
```
Values array is: 
"; print_r($values); ?>
```
Conclusion

In this PHP Tutorial, we learned how to get all values in an array, using PHP Array array_values() function.

Источник

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What is array values in php

array_values

Parameters

Return Values

Examples

See Also

PHP 8.2

array_values

Parameters

Return Values

Examples

See Also

User Contributed Notes 6 notes

What is array values in php

PHP array_values() – Get Values in Array

PHP array_values() Function

Syntax of array_values()

2. Get Values from an Indexed Array

3. Get Values from an Array with Default Index

Conclusion