PHP Arrays
An array stores multiple values in one single variable:
Example
<html>
<body>
<?php
$cars=array("Volvo","BMW","Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>
</body>
</html>
<body>
<?php
$cars=array("Volvo","BMW","Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>
</body>
</html>
What is an Array?
An array is a special variable, which can hold more than one value at a time.
If you have a list of items (a list of car names, for example), storing the cars in single variables could look like this:
Create an Array in PHP
In PHP, the array() function is used to create an array:
array();
In PHP, there are three types of arrays:
- Indexed arrays - Arrays with numeric index
- Associative arrays - Arrays with named keys
- Multidimensional arrays - Arrays containing one or more arrays
PHP Indexed Arrays
There are two ways to create indexed arrays:
The index can be assigned automatically (index always starts at 0):
Example
<html>
<body>
<?php
$cars=array("Volvo","BMW","Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>
</body>
</html>
<body>
<?php
$cars=array("Volvo","BMW","Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>
</body>
</html>
Get The Length of an Array - The count() Function
The count() function is used to return the length (the number of elements) of an array:
Example
<html>
<body>
<?php
$cars=array("Volvo","BMW","Toyota");
$arrlength=count($cars);
for($x=0;$x<$arrlength;$x++)
{
echo $cars[$x];
echo "<br>";
}
?>
</body>
</html>
<body>
<?php
$cars=array("Volvo","BMW","Toyota");
$arrlength=count($cars);
for($x=0;$x<$arrlength;$x++)
{
echo $cars[$x];
echo "<br>";
}
?>
</body>
</html>
PHP Associative Arrays
Associative arrays are arrays that use named keys that you assign to them.
There are two ways to create an associative array:
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
or:
Example
<html>
<body>
<?php
$age=array("asad"=>"35","ali"=>"37","zahid"=>"43");
echo "Peter is " . $age['asad'] . " years old.";
?>
</body>
</html>
<body>
<?php
$age=array("asad"=>"35","ali"=>"37","zahid"=>"43");
echo "Peter is " . $age['asad'] . " years old.";
?>
</body>
</html>
Loop Through an Associative Array
To loop through and print all the values of an associative array, you could use a foreach loop, like this:
Example
<html>
<body>
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
foreach($age as $x=>$x_value)
{
echo "Key=" . $x . ", Value=" . $x_value;
echo "<br>";
}
?>
</body>
</html>
<body>
<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
foreach($age as $x=>$x_value)
{
echo "Key=" . $x . ", Value=" . $x_value;
echo "<br>";
}
?>
</body>
</html>
PHP Multidimensional Arrays
An array can also contain another array as a value, which in turn can hold other arrays as well. In such a way we can create two- or three-dimensional arrays:
Example
<html>
<body>
<?php
// A two-dimensional array
$cars = array
(
array("Volvo",100,96),
array("BMW",60,59),
array("Toyota",110,100)
);
echo $cars[0][0].": Ordered: ".$cars[0][1].". Sold: ".$cars[0][2]."<br>";
echo $cars[1][0].": Ordered: ".$cars[1][1].". Sold: ".$cars[1][2]."<br>";
echo $cars[2][0].": Ordered: ".$cars[2][1].". Sold: ".$cars[2][2]."<br>";
?>
</body>
</html>
<body>
<?php
// A two-dimensional array
$cars = array
(
array("Volvo",100,96),
array("BMW",60,59),
array("Toyota",110,100)
);
echo $cars[0][0].": Ordered: ".$cars[0][1].". Sold: ".$cars[0][2]."<br>";
echo $cars[1][0].": Ordered: ".$cars[1][1].". Sold: ".$cars[1][2]."<br>";
echo $cars[2][0].": Ordered: ".$cars[2][1].". Sold: ".$cars[2][2]."<br>";
?>
</body>
</html>
PHP - Multidimensional Arrays
A multidimensional array is an array containing one or more arrays.
In a multidimensional array, each element in the main array can also be an array. And each element in the sub-array can be an array, and so on.
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