In PHP it is very simple to define array and traverse them easily.
Example :
<html>
<head><title>PHP array</title></head>
<body>
<?php
$name = array("john", "bill", "steve"); // an simple array
for($i=0; $i<count($name); $i++ ) {
echo "$name[$i]<br/>";
}
?>
</body>
</html>
OUTPUT :-
john
bill
steve
though this is a very basic type of array traversing PHP provide some advanced mean of array traversing using foreach loop
An example using foreach loop : -
Example :
<html>
<head><title>PHP array</title></head>
<body>
<?php
$name = array("john", "bill", "steve"); // an simple array
for($i=0; $i<count($name); $i++ ) {
echo "$name[$i]<br/>";
}
?>
</body>
</html>
OUTPUT :-
john
bill
steve
though this is a very basic type of array traversing PHP provide some advanced mean of array traversing using foreach loop
An example using foreach loop : -
<html>
<head><title>PHP array traverser using foreach loop</title></head>
<body>
<?php
$name = array("john", "bill", "steve"); // an simple array
foreach ($name as $var) {
echo "$var<br/>";
}
?>
</body>
</html>
Output :-
john
bill
steve
working of foreach loop : -
1. first it implicitly determine the length of array
2 than it traverse array till the end.
3. at each iteration it creates a variable $var for each element of passed array.
Simple!!
array traversing using foreach loop require less number of steps than conventional for loop.
Multi dimensional array traversing : -
multi dimension array are simply array within one array.
e.g.
$student = array(array("Math", "Physics", "Chemistry"), array("90","76","66"));
here is an student array with size two containing two secondary array for subject ans marks.
<html>
<head><title>PHP Multi dimensional array traversing</title></head>
<body>
<?php
$student = array(array("Math", "Physics", "Chemistry"), array("90","76","66"));
// an simplemulti dimesional array
$sub = 0; // index of subject array.
$marks = 1; // index of mark array.
for ($i=0; $i<count($student[$sub]); $i++)
{
echo $student[$sub][$i]." : ".$student[$marks][$i];
echo "<br/>";
}
?>
</body>
</html>
Output will be :
Math : 90
Physics : 76
Chemistry : 66
Adding elements to array dynamically :-
<html>
<head><title>PHP adding array elements dynamically</title></head>
<body>
<?php
$example = array("a","b","c");
$example[] = "d";
foreach ($example as $new) {
echo "$new<br/>";
}
?>
</body>
</html>
Output : -
a
b
c
d
