What
Is PHP?
PHP
stands for “Hypertext Pre-processors”.
It is server side scripting language and used for developing web applications
and It's allows us to dynamically create generated web pages.
PHP
has many frameworks and CMS and used
for creating websites. The PHP
is very easy to create sites using its CMS.
The PHP is an Object Oriented Programming (OOPs) language.
What
Is an Array in PHP?
List
Types of Array Are Available in PHP?
The PHP
Array is special types of variable which stores multiple values in a single
variable.
There are three types of array available i.e.
1. Indexed
Arrays
2. Associative
Arrays
3. Multidimensional
Arrays
How
To Create an Empty Array in PHP?
Creating an empty array is very easy in PHP and
we can create an array using array()
function or simply using assigning []
in the front of variable in PHP.
The Example is:
$array1=array();
OR
$array1=[];
How
To Get Number of Elements in an Array?
We can use count
() function to count the number of elements in a PHP Array.
The Example is:
$array=['Anil', 'Sunil', 'Sushil', 'Aradhya', 'Reena'];
echo count($array); // The output is – 5
How
To Get a Random Value from a PHP Array?
PHP
array_rand() function is used to returns a random key from
an array. If you specify that the function should return more than one key.
As of PHP
5.2.10, the resulting array of keys is no longer shuffled.
Syntax -
array_rand(array,number)
The Example is:
<?php
$ary=array("Anil", "Sunil", "Sudhil", "Aradhya", "Reena");
$random_keys=array_rand($ary, 4);
echo $ary[$random_keys[0]]."<br/>";
echo $ary[$random_keys[1]]."<br/>";
echo $ary[$random_keys[2]]."<br/>";
echo $ary[$random_keys[3]];
?>
How
To Remove Specific Element from an Array?
The PHP
array_search()
function is used to get the first matching key of the given value and then you
can delete it with unset().
The example is:
if (false !== $key = array_search(401, $array)) {
unset($array[$key]);
}
What
Is the Best Way To Delete Array Item in PHP?
Generally unset () function is safe for hashtables,
but if you have to rely on continous numeric indexes you'll have to use either array_splice()
or a combination of unset() and array_values().
The Example is –
$a1 = array('a' => 1, 'b' => 2, 'c' => 3);
unset($a1['b']);
// array('a' => 1,
'c' => 3)
$a2 = array(1, 2, 3);
unset($a2[1]);
// array(0 => 1, 2
=> 3)
// note the missing
index 1
// solution 1 for
numeric arrays
$a3 = array(1, 2, 3);
array_splice($a3, 1, 1);
// array(0 => 1, 1
=> 3)
// index is now
continous
// solution 2 for
numeric arrays
$a4 = array(1, 2, 3);
unset($a4[1]);
$a4 = array_values($a4);
// array(0 => 1, 1
=> 3)
// index is now
continous