PHP for Loop
The for loop in PHP is a fundamental control flow structure that allows you to execute a block of code repeatedly, a specific number of times.
Syntax
for (expression1, expression2, expression3) {
// code block
}
This is how it works:
expression1 is evaluated once
expression2 is evaluated before each iterarion
expression3 is evaluated after each iterarion
Example
Print the numbers from 0 to 10:
<!DOCTYPE html>
<html>
<body>
<?php
for ($x = 0; $x <= 10; $x++) {
echo "The number is: $x
";
}
?>
</body>
</html>
Output
The number is: 0
The number is: 1
The number is: 2
The number is: 3
The number is: 4
The number is: 5
The number is: 6
The number is: 7
The number is: 8
The number is: 9
The number is: 10
Explained
The first expression, $x = 0;, is evaluated once and sets a counter to 0.
The second expression, $x <= 10;, is evaluated before each iteration, and the code block is only executed if this expression evaluates to true. In this example the expression is true as long as $x is less than, or equal to, 10.
The third expression, $x++;, is evaluated after each iteration, and in this example, the expression increases the value of $x by one at each iteration.
• The break Statement
The break statement is a control flow statement used in looping constructs (like for, while, do-while, and foreach) and switch statements in various programming languages, including PHP:
Example
<!DOCTYPE html>
<html>
<body>
<?php
for ($x = 0; $x <= 10; $x++) {
if ($x == 3) break;
echo "The number is: $x
";
}
?>
</body>
</html>
Output
The number is: 0
The number is: 1
The number is: 2
• The continue Statement
the continue statement serves a specific purpose within looping constructs.
Example
<!DOCTYPE html>
<html>
<body>
\<?php
for ($x = 0; $x <= 10; $x++) {
if ($x == 3) continue;
echo "The number is: $x
";
}
?>
</body>
</html>
Output
The number is: 0
The number is: 1
The number is: 2
The number is: 4
The number is: 5
The number is: 6
The number is: 7
The number is: 8
The number is: 9
The number is: 10