Installing and configuring PHP String Functions
Requirements
PHP String functions do not require any external library files.
Installation
Since PHP String functions are part of the PHP core, they don't require any installation.
Runtime Configuration
You don't need to add any directive in php.ini for running PHP String functions.
Resource Types
PHP String functions have no defined resource types defined.
Predefined constants
In the following table, we have given a list of constants which are part of the PHP core.
Constant's Name | Type |
---|---|
CRYPT_SALT_LENGTH | Integer |
CRYPT_STD_DES | Integer |
CRYPT_EXT_DES | Integer |
CRYPT_MD5 | Integer |
CRYPT_BLOWFISH | Integer |
HTML_SPECIALCHARS | Integer |
HTML_ENTITIES | Integer |
ENT_COMPAT | Integer |
ENT_QUOTES | Integer |
ENT_NOQUOTES | Integer |
CHAR_MAX | Integer |
LC_CTYPE | Integer |
LC_NUMERIC | Integer |
LC_TIME | Integer |
LC_COLLATE | Integer |
LC_MONETARY | Integer |
LC_ALL | Integer |
LC_MESSAGES | Integer |
STR_PAD_LEFT | Integer |
STR_PAD_RIGHT | Integer |
STR_PAD_BOTH | Integer |
See also
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Next: addcslashes
PHP: Tips of the Day
How to Sort Multi-dimensional Array by Value?
Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:
Example:
function sortByOrder($a, $b) { return $a['order'] - $b['order']; } usort($myArray, 'sortByOrder');
Starting in PHP 5.3, you can use an anonymous function:
usort($myArray, function($a, $b) { return $a['order'] - $b['order']; });
And finally with PHP 7 you can use the spaceship operator:
usort($myArray, function($a, $b) { return $a['order'] <=> $b['order']; });
To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.
usort($myArray, function($a, $b) { $retval = $a['order'] <=> $b['order']; if ($retval == 0) { $retval = $a['suborder'] <=> $b['suborder']; if ($retval == 0) { $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder']; } } return $retval; });
If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual
Ref : https://bit.ly/3i77vCC
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