Author Archive
Using usort in PHP
usort – Sort an array by values using a user-defined comparison function
Description
bool usort ( array array, callback cmp_function)
This function will sort an array by its values using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function.
The comparison function […]
Using uksort in PHP
uksort – Sort an array by keys using a user-defined comparison function
Description
bool uksort ( array array, callback cmp_function)
uksort() will sort the keys of an array using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function.
Function cmp_function should accept […]
Using uasort in PHP
uasort – Sort an array with a user-defined comparison function and maintain index association
Description
bool uasort ( array array, callback cmp_function)
This function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is used mainly when sorting associative arrays where the actual element order […]
Using Sort Function in PHP
sort – Sort an array
Description
bool sort ( array array [, int sort_flags])
This function sorts an array. Elements will be arranged from lowest to highest when this function has completed.
Note: This function assigns new keys for the elements in array. It will remove any existing keys you may have assigned, rather than just reordering the […]
Using shuffle in PHP
shuffle – Shuffle an array
Description
void shuffle ( array array)
This function shuffles (randomizes the order of the elements in) an array. You must use srand() to seed this function.
Example 1. shuffle() example
<?php
$numbers = range(1, 20);
srand((float)microtime() * 1000000);
shuffle($numbers);
while (list(, $number) = each($numbers)) {
echo “$number “;
}
?>
Note: As of PHP 4.2.0, there is no […]
Using rsort in PHP
rsort – Sort an array in reverse order
Description
bool rsort ( array array [, int sort_flags])
This function sorts an array in reverse order (highest to lowest).
Returns TRUE on success or FALSE on failure.
Example 1. rsort() example
<?php
$fruits = array(“lemon”, “orange”, “banana”, “apple”);
rsort($fruits);
reset($fruits);
while (list($key, $val) = each($fruits)) {
echo “$key = $val\n“;
}
?>
This example would display:
0 = orange
1 = […]
Using reset in PHP
reset – Set the internal pointer of an array to its first element
Description
mixed reset ( array array)
reset() rewinds array’s internal pointer to the first element and returns the value of the first array element.
Example 1. reset() example
<?php
$array = array(’step one’, ’step two’, ’step three’, ’step four’);
// by default, […]
Using range function in PHP
range – Create an array containing a range of elements
Description
array range ( int low, int high [, int step])
range() returns an array of elements from low to high, inclusive. If low > high, the sequence will be from high to low.
New parameter: The optional step parameter was added in 5.0.0.
If a step value […]
Using Prev in PHP
prev – Rewind the internal array pointer
Description
mixed prev ( array array)
Returns the array value in the previous place that’s pointed to by the internal array pointer, or FALSE if there are no more elements.
Warning
If the array contains empty elements then this function will return FALSE for these elements as well. To properly traverse an […]
Using Next Function in PHP
next – Advance the internal array pointer of an array
Description
mixed next ( array array)
Returns the array value in the next place that’s pointed to by the internal array pointer, or FALSE if there are no more elements.
next() behaves like current(), with one difference. It advances the internal array pointer one place forward before […]