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PHP code must always being with the long form opening tag. If a file contains only PHP code, the end tag may optionally be omitted from the end of a the file.

<?php

?>

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Programming Styles

Strings

Literals

Strings consisting of more than one character should be surrounded with double-quotes ("). Strings consisting of only a single character may be surrounded with single-quotes (').

$str = "This is a long string";
$chr = 'a';

Concatenation

Run-on Strings

A string whose length requires it to wrap multiple lines should be concatenated with the concatenation character (.) appended at the end of the line, with the carry-over line indented below it.

$str = "This is a string that needs to " .
 "wrap onto another line.";

Variable Substitution

When a variable needs to be added to a string the string should be broken open and concatenated together to improve readability.

$name = "Hefo Quient Esbit";
$str = "Hello " . $name . "! How are you?"

Arrays

Numerically Index Arrays

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