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PHP Looping - For Loops
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Loops execute a block of code a specified number of times, or while a specified condition is true.
The for Loop
The for loop is used when you know in advance how many times the script should run.
Syntax
| for (init; condition; increment) { code to be executed; } |
Parameters:
- init: Mostly used to set a counter (but can be any code to be executed once at the beginning of the loop)
- condition: Evaluated for each loop iteration. If it evaluates to TRUE, the loop continues. If it evaluates to FALSE, the loop ends.
- increment: Mostly used to increment a counter (but can be any code to be executed at the end of the loop)
Note: Each of the parameters above can be empty, or have multiple expressions (separated by commas).
Example
The example below defines a loop that starts with i=1. The loop will continue to run as long as i is less than, or equal to 5. i will increase by 1 each time the loop runs:
| <html> <body> <?php for ($i=1; $i<=5; $i++) { echo "The number is " . $i . "<br />"; } ?> </body> </html> |
Output:
| The number is 1 The number is 2 The number is 3 The number is 4 The number is 5 |
The foreach Loop
The foreach loop is used to loop through arrays.
Syntax
| foreach ($array as$value) { code to be executed; } |
For every loop iteration, the value of the current array element is assigned to $value (and the array pointer is moved by one) - so on the next loop iteration, you'll be looking at the next array value.
Example
The following example demonstrates a loop that will print the values of the given array:
| <html> <body> <?php $x=array("one","two","three"); foreach ($x as $value) { echo $value . "<br />"; } ?> </body> </html> |
Output:
| one two three |
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