PHPBeginner

PHP Control Flow

Control program flow in PHP: if, elseif, and else, for loops, while loops, and the modern match expression.

01if, elseif, else

main.php

<?php
$score = 72;
if ($score >= 90) {
    echo "A\n";
} elseif ($score >= 70) {
    echo "B\n";
} else {
    echo "C\n";
}

Output

02for loop

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main.php

<?php
for ($i = 1; $i <= 5; $i++) {
    echo $i, " ";
}
echo "\n";

Output

1 2 3 4 5

03while loop

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main.php

<?php
$n = 3;
while ($n > 0) {
    echo $n, " ";
    $n--;
}
echo "\n";

Output

3 2 1

04match expression

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main.php

<?php
$status = "active";
$label = match($status) {
    "active" => "Running",
    "stopped" => "Halted",
    default => "Unknown",
};
echo $label, "\n";

Output

Running