The PHP documentation has more information if you'd like. You can find it here: http://www.php.net/manual/en/intro-whatcando.php. This document is part of the language documentation which also available for download. See FAQ item General:  1. (Back)

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(Back)

	&&		AND
	||		OR
	!		NOT
	=		assigment
	==		comparison
	===		comparison and of the same type
	!=		not equal
	<		less than
	>		greater than
	!<		not less than
	!>		not greater than

The use of camel case is also common, such as customFunction(). The Kaomso preferred is to use all lower case in instances where there is only one word and to use initial capitals for cases where more than one word is used. For example, CustomFunction(). The distinction between this and camel case is subtle, but preferred due to consistency.

There are also conventions concerning the style around opening and closing curly brackets ({ and }) for code blocks. The PHP norm is to put each on its own line, with the opening bracket on the line immediately following the beginning of the code block. For example:

if(condition)
{
	code
	.
	.
	.
}

if(condition){
	code
	.
	.
	.}

if(condition)   {code}
else            {AlternateCode}

if(condition)
{
	code
}
else
{
	AlternateCode
}

There is one gotcha to be aware of however. In some instances an attempt to compare strings that may be interpretted as boolean may create undesirable behavior. For cases like these, use the === operator (three equals signs) which compares both the value and type. (Back)

#! [PATH_TO_PHP]

#! /usr/bin/php

function FUNCTIONNAME(ARGUMENT, ARGUMENT)
{
	.
	.
	.
	code
	.
	.
	.
}

To declare a function use the function PHP reserved word followed by the name of the function name and a pair of parentheses. If the function will accept arguments, then put a comma-separated list of variables the argument values will be assigned to in the parentheses. Note that the order the variables in the parentheses are supplied in the order they will need to be supplied in when the function is called in the script. There's no need to define the return type of the function in the declaration.

The function notation for PHP will likely be very familiar to anyone who has worked with some other languages such as C, C++, Java, .NET, or JavaScript. (Back)

	&       AND         ($variable_A & $variable_B)
	|       OR          ($variable_A | $variable_B)
	^       XOR         ($variable_A ^ $variable_B)
	~       NOT         (~ $variable)
	<<      shift left  ($variable_A << $variable_B)
	>>      shift right ($variable_A >> $variable_B)

(Back)

gGlobalVar = "The global value is a string.";

function CustomFunc()
{
	global gGlobalVar;
	
	.
	.
	.
}

• Using Register Globals
• Description of core php.ini directives
• Predefined Variables
• CGI Environment Variables