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  Entities for the categorized extension list, so it does not need
  to be translated, and thus it is not going to be outdated.
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<!ENTITY extcat.intro '<title xmlns="http://docbook.org/ns/docbook">Extension List/Categorization</title><para xmlns="http://docbook.org/ns/docbook">This
appendix categorizes more than 150 extensions documented in the PHP
Manual by several criteria.</para>'>

<!ENTITY extcat.alphabetical '<title xmlns="http://docbook.org/ns/docbook">Alphabetical</title>'>

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<!ENTITY extcat.purpose '<title xmlns="http://docbook.org/ns/docbook">Purpose</title>'>

<!ENTITY extcat.purpose.basic '<title xmlns="http://docbook.org/ns/docbook">Basic PHP Extensions</title>'>
<!ENTITY extcat.purpose.basic.vartype '<title xmlns="http://docbook.org/ns/docbook">Variable and Type Related Extensions</title>'>
<!ENTITY extcat.purpose.basic.text '<title xmlns="http://docbook.org/ns/docbook">Text Processing</title>'>
<!ENTITY extcat.purpose.basic.php "<title xmlns='http://docbook.org/ns/docbook'>Affecting PHP's Behaviour</title>">
<!ENTITY extcat.purpose.basic.session '<title xmlns="http://docbook.org/ns/docbook">Session Extensions</title>'>
<!ENTITY extcat.purpose.basic.other '<title xmlns="http://docbook.org/ns/docbook">Other Basic Extensions</title>'>

<!ENTITY extcat.purpose.database '<title xmlns="http://docbook.org/ns/docbook">Database Extensions</title>'>
<!ENTITY extcat.purpose.database.abstract '<title xmlns="http://docbook.org/ns/docbook">Abstraction Layers</title>'>
<!ENTITY extcat.purpose.database.vendors '<title xmlns="http://docbook.org/ns/docbook">Vendor Specific Database Extensions</title>'>

<!ENTITY extcat.purpose.xml '<title xmlns="http://docbook.org/ns/docbook">XML Manipulation</title>'>

<!ENTITY extcat.purpose.webservice '<title xmlns="http://docbook.org/ns/docbook">Web Services</title>'>

<!ENTITY extcat.purpose.creditcard '<title xmlns="http://docbook.org/ns/docbook">Credit Card Processing</title>'>
   
<!ENTITY extcat.purpose.mathcrypto '<title xmlns="http://docbook.org/ns/docbook">Math and Cryptography</title>'>
<!ENTITY extcat.purpose.mathcrypto.math '<title xmlns="http://docbook.org/ns/docbook">Mathematical Extensions</title>'>
<!ENTITY extcat.purpose.mathcrypto.crypto '<title xmlns="http://docbook.org/ns/docbook">Cryptography Extensions</title>'>

<!ENTITY extcat.purpose.international '<title xmlns="http://docbook.org/ns/docbook">Human Language and Character Encoding Support</title>'>
   
<!ENTITY extcat.purpose.fileprocess '<title xmlns="http://docbook.org/ns/docbook">File System and Process Control</title>'>
<!ENTITY extcat.purpose.fileprocess.file '<title xmlns="http://docbook.org/ns/docbook">File System Related Extensions</title>'>
<!ENTITY extcat.purpose.fileprocess.process '<title xmlns="http://docbook.org/ns/docbook">Process Control Extensions</title>'>

<!ENTITY extcat.purpose.remote '<title xmlns="http://docbook.org/ns/docbook">Accessing Services</title>'>
<!ENTITY extcat.purpose.remote.mail '<title xmlns="http://docbook.org/ns/docbook">Mail Related Extensions</title>'>
<!ENTITY extcat.purpose.remote.auth '<title xmlns="http://docbook.org/ns/docbook">Authentication Services</title>'>
<!ENTITY extcat.purpose.remote.other '<title xmlns="http://docbook.org/ns/docbook">Other Services</title>'>

<!ENTITY extcat.purpose.compression '<title xmlns="http://docbook.org/ns/docbook">Compression and Archive Extensions</title>'>

<!ENTITY extcat.purpose.calendar '<title xmlns="http://docbook.org/ns/docbook">Date and Time Related Extensions</title>'>

<!ENTITY extcat.purpose.utilspec '<title xmlns="http://docbook.org/ns/docbook">Utilization Area Specific Extensions</title>'>
<!ENTITY extcat.purpose.utilspec.nontext '<title xmlns="http://docbook.org/ns/docbook">Non-Text MIME Output</title>'>
<!ENTITY extcat.purpose.utilspec.image '<title xmlns="http://docbook.org/ns/docbook">Image Processing and Generation</title>'>
<!ENTITY extcat.purpose.utilspec.audio '<title xmlns="http://docbook.org/ns/docbook">Audio Formats Manipulation</title>'>
<!ENTITY extcat.purpose.utilspec.cmdline '<title xmlns="http://docbook.org/ns/docbook">Command Line Specific Extensions</title>'>
<!ENTITY extcat.purpose.utilspec.windows '<title xmlns="http://docbook.org/ns/docbook">Windows Only Extensions</title>'>
<!ENTITY extcat.purpose.utilspec.server '<title xmlns="http://docbook.org/ns/docbook">Server Specific Extensions</title>'>
    
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<!ENTITY extcat.membership '<title xmlns="http://docbook.org/ns/docbook">Membership</title>'>

<!ENTITY extcat.membership.core '<title xmlns="http://docbook.org/ns/docbook">Core Extensions</title><para xmlns="http://docbook.org/ns/docbook">These
are not actual extensions. They are part of the PHP core and cannot be
left out of a PHP binary with compilation options.</para>'>

<!ENTITY extcat.membership.bundled '<title xmlns="http://docbook.org/ns/docbook">Bundled Extensions</title><para xmlns="http://docbook.org/ns/docbook">These
extensions are bundled with PHP.</para>'>

<!ENTITY extcat.membership.external '<title xmlns="http://docbook.org/ns/docbook">External Extensions</title><para xmlns="http://docbook.org/ns/docbook">These
extensions are bundled with PHP but in order to compile them, external libraries will be needed.</para>'>

<!ENTITY extcat.membership.pecl '<title xmlns="http://docbook.org/ns/docbook">PECL Extensions</title><para xmlns="http://docbook.org/ns/docbook">These
extensions are available from <link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="&url.pecl;">PECL</link>. They may require external libraries. More PECL
extensions exist but they are not documented in the PHP manual yet.</para>'>

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<!ENTITY extcat.state '<title xmlns="http://docbook.org/ns/docbook">State</title><para xmlns="http://docbook.org/ns/docbook">This part lists extensions not
intended for the production use - they are either too "old" (deprecated) or
"new" (experimental).</para>'>

<!ENTITY extcat.state.deprecated '<title xmlns="http://docbook.org/ns/docbook">Deprecated Extensions</title><para xmlns="http://docbook.org/ns/docbook">These
extensions have been deprecated usually in the favor of some other extensions.</para>'>

<!ENTITY extcat.state.experimental '<title xmlns="http://docbook.org/ns/docbook">Experimental Extensions</title><para xmlns="http://docbook.org/ns/docbook">The
behaviour of these extensions - including the names of their functions and anything
else documented about these extensions - may change without notice in a future release
of PHP. Use these extensions at your own risk.</para>'>