PHP: Spotting References - Manual in Deutsh
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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

PHP Manual
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Spotting References

Many syntax constructs in PHP are implemented via referencing mechanisms, so everything told above about reference binding also apply to these constructs. Some constructs, like passing and returning by-reference, are mentioned above. Other constructs that use references are:

global References

When you declare variable as global $var you are in fact creating reference to a global variable. That means, this is the same as:

<?php
$var
=& $GLOBALS["var"];
?>

That means, for example, that unsetting $var won't unset global variable.

$this

In an object method, $this is always a reference to the caller object.

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Another Useful functions:


zendapi-reference | reference.pcre.pattern.syntax | reference.pcre.pattern.modifiers | language.references.whatdo | language.references.unset | language.references.spot | language.references.return | language.references.pass | language.references | language.references.arent | function.mb-preferred-mime-name | function.ldap-parse-reference | function.ldap-next-reference | function.ldap-first-reference | function.domdocument-create-entity-reference | function.dom-domentityreference-construct | function.dom-domdocument-createentityreference | function.cpdf-set-viewer-preferences |


PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.