PHP Array Sorting
The elements in the array can be arranged in descending or ascending order alphabetically or numerically.
PHP - Array sorting function
In this chapter, we will introduce the following PHP arrays one by one Sorting function:
· sort() - Sort the array in ascending order
· rsort() - Sort the array in descending order
· asort() - Sort the array according to the Value, sort the array in ascending order
· ksort() - Sort the array in ascending order based on the key of the associative array
· arsort() - Sort the array in descending order based on the value of the associative array Arrangement
· krsort() - Sort the array in descending order according to the key of the associative array
· shuffle() - Randomly sort the elements in the array
· array_reverse() - Reverse is to reverse the order of each element in an original array
##sort() - Sort the array in ascending order
The following example sorts the elements in the $cars array in ascending alphabetical order:
Example
<?php
$cars=array("Volvo","BMW","Toyota");
sort($cars);
?>
The following example sorts the elements in the $numbers array in ascending numerical order:
Example
<?php
$numbers=array(4,6,2,22,11);
sort($numbers);
?>
rsort() - Sort the array in descending order
The following example sorts the elements in the $cars array in descending alphabetical order:
Example
<?php
$cars=array("Volvo","BMW","Toyota");
rsort($cars);
?>
The following example sorts the elements in the $numbers array in descending numerical order:
Example
<?php
$numbers=array(4,6,2,22,11);
rsort($numbers);
?>
##asort() - Sort the array in ascending order based on its value The following example sorts the associative array in ascending order according to the value of the array:
Example
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
asort($age);
?>
ksort() - Sort the array in ascending order according to the key of the array The following example sorts the associative array in ascending order according to the key of the array:
Example
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
ksort($age);
?>
##arsort() - Sort the array in descending order based on the value of the array
The following example sorts the associative array in descending order according to the value of the array:
Example
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
arsort($age);
?>
##krsort() - Sort the array in descending order according to the key of the array
The following example is based on the key of the array , sort the associative array in descending order: Instance
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
krsort($age);
?> shuffle() - Randomly sort the elements in the array
Use the shuffle function to randomly sort the elements in the array bool shuffle ( array &$array )
<?php
$my_array = array("red","green","blue","yellow","purple");shuffle($my_array);
print_r($my_array);
?>Every time the above code is executed, the order of output is different. We use it to achieve random ranking
Note: After the associative array is shuffled, Keys will be lost
array_reverse() - Reverse is to reverse the order of each element in an original array
Reverse order ≠ Descending order
Reverse order is to reverse the order of each element in an original array
array array_reverse ( array $array [, bool $preserve_keys = false ] )
If the array is an associative array
• The reverse order will not be affected when the keys are characters, and the keys will still be retained
• When the key is a number, the default key will be reset to 0, 1, 2 after reverse order...
• When the second parameter is true, the key is a number, and the numerical key will be retained in reverse order
<?php
$names = array(10 => '张三', 60 => '阿毛', 30 => '李四', 25 => '宝哥');
print_r(array_reverse($names));
print_r(array_reverse($names, true));
?>
Complete PHP Array Reference Manual
For a complete reference manual for all array functions, please visit our PHP Array Reference Manual.
This reference manual provides a brief description and application examples of each function!
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