Use of usort() function in PHP

The usort() function in PHP sorts a given array by using a user-defined comparison function. This function is useful in case if we want to sort the array in a new manner. This function assigns new integral keys starting from zero to the elements present in the array and the old keys are lost.

What is the use of Asort () function in PHP?
What is Array_keys () used for?
How do you sort an object in PHP?
How do you sort an array of objects in PHP?
What is Asort PHP?
What is Ksort PHP?
What is the difference between ECHO and print?
How do you use an array?
What is array values in PHP?
How does Usort work in PHP?
How do I sort a 2d array in PHP?
How do you sort an array of associative arrays by the value of a given key in PHP?

What is the use of Asort () function in PHP?

Definition and Usage

The asort() function sorts an associative array in ascending order, according to the value. Tip: Use the arsort() function to sort an associative array in descending order, according to the value. Tip: Use the ksort() function to sort an associative array in ascending order, according to the key.

What is Array_keys () used for?

The array_keys() is a built-in function in PHP and is used to return either all the keys of and array or the subset of the keys. Parameters: The function takes three parameters out of which one is mandatory and other two are optional.

How do you sort an object in PHP?

The usort() function can also be used to sort an array of objects by object field. Call usort() function with first argument as the array of objects and second argument as the comparator function on the basis of which comparison between two array objects has to be made. print ( "\nSorted object array:\n" );

How do you sort an array of objects in PHP?

20 Answers

Using anonymous functions (from PHP 5.3) usort($your_data, function($a, $b) return strcmp($a->name, $b->name););
From inside a class usort($your_data, array($this, "cmp")); // "cmp" should be a method in the class.
Using arrow functions (from PHP 7.4)

What is Asort PHP?

The asort() function is an inbuilt function in PHP which is used to sort an array according to values. It sorts in a way that relation between indices and values is maintained. By default it sorts in ascending order of values. Syntax: bool asort( $array, $sorting_type )

What is Ksort PHP?

The ksort() function is an inbuilt function in PHP which is used to sort an array in ascending order according to its key values.

What is the difference between ECHO and print?

echo and print are more or less the same. They are both used to output data to the screen. The differences are small: echo has no return value while print has a return value of 1 so it can be used in expressions. echo can take multiple parameters (although such usage is rare) while print can take one argument.

How do you use an array?

The in_array() function searches an array for a specific value. Note: If the search parameter is a string and the type parameter is set to TRUE, the search is case-sensitive.

What is array values in PHP?

The array_values() function returns an array containing all the values of an array. Tip: The returned array will have numeric keys, starting at 0 and increase by 1.

How does Usort work in PHP?

How do I sort a 2d array in PHP?

PHP array_multisort() Function

Return a sorted array in ascending order: $a=array("Dog","Cat","Horse","Bear","Zebra"); ...
Return a sorted array in ascending order: $a1=array("Dog","Cat"); ...
See how it sorts when two values are the same: ...
Using sorting parameters: ...
Merge two arrays and sort them as numbers, in descending order:

How do you sort an array of associative arrays by the value of a given key in PHP?

Use array_multisort() Function to Sort an Array of Associative Arrays by the Value of a Given Key in PHP. It is the array that we want to sort. It specifies the order in which we will sort our array. It can be SORT_ASC for ascending order and SORT_DESC for descending order.