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PHP Looping
Looping statements in PHP are used to execute the same block of code a specified number of times.
Looping Very often when you write code, you want the same block of code to run a number of times. You can use looping statements in your code to perform this. In PHP we have the following looping statements:
The while statement will execute a block of code if and as long as a condition is true. Syntax while (condition) code to be executed; |
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Example
The following example demonstrates a loop that will continue to run as long as the variable i is less than, or equal to 5. i will increase by 1 each time the loop runs: $i=1; while($i<=5) { echo "The number is " . $i . " "; $i++; } ?> The do...while Statement The do...while statement will execute a block of code at least once - it then will repeat the loop as long as a condition is true. Syntax do { code to be executed; } while (condition); Example The following example will increment the value of i at least once, and it will continue incrementing the variable i as long as it has a value of less than 5: $i=0; do { $i++; echo "The number is " . $i . " "; } while ($i<5); ?> |
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The for Statement
The for statement is the most advanced of the loops in PHP. In it's simplest form, the for statement is used when you know how many times you want to execute a statement or a list of statements. Syntax for (init; cond; incr) { code to be executed; } Parameters:
The following example prints the text "Hello World!" five times: for ($i=1; $i<=5; $i++) { echo "Hello World! "; } ?> The foreach Statement The foreach statement is used to loop through arrays. For every loop, the value of the current array element is assigned to $value (and the array pointer is moved by one) - so on the next loop, you'll be looking at the next element. Syntax foreach (array as value) { code to be executed; } Example The following example demonstrates a loop that will print the values of the given array: $arr=array("one", "two", "three"); foreach ($arr as $value) { echo "Value: " . $value . " "; } ?> |