Page History

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All PHP files should be encoded using UTF-8, with no byte-order-mark (BOM).

Programming

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Style

Variables

Use logical and descriptive names for your variables. Variables used in iterating loops, such as $i, $j, $k, etc., are exceptions to this rule. Variables should contain only lower-case letters, underscores, and numbers, and should start with a letter. Values true, false, and null should always be lower-case.

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if ($foo > $bar) {
    echo "foo is greater";
}
else {
    echo "bar is greater";
}

$i = 5;
do {
    echo $i--;
} while ($i > 0);

Classes

Class names should be CamelCased. Only a single class should appear in a file. Class file names should be lowercase and use underscores to separate words.

<?php
class myClass {
}
?>

<?php 
class MyClass {
}
?>

Methods

Comments

There are three types of comments that may be used in PHP. They are block comments (/* */), inline comments (//), and shell comments (#).

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