预定义常量
下列常量由此扩展定义，且仅在此扩展编译入 PHP 或在运行时动态载入时可用。
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XSL_CLONE_AUTO( integer) -
XSL_CLONE_NEVER( integer) -
XSL_CLONE_ALWAYS( integer) -
LIBXSLT_VERSION( integer) - libxslt version like 10117. Available as of PHP 5.1.2.
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LIBXSLT_DOTTED_VERSION( string) - libxslt version like 1.1.17. Available as of PHP 5.1.2.
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LIBEXSLT_VERSION( integer) - libexslt version like 813. Available as of PHP 5.1.2.
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LIBEXSLT_DOTTED_VERSION( string) - libexslt version like 1.1.17. Available as of PHP 5.1.2.
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XSL_SECPREF_NONE( integer) - Deactivate all security restrictions.
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XSL_SECPREF_READ_FILE( integer) - Disallows reading files.
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XSL_SECPREF_WRITE_FILE( integer) - Disallows writing files.
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XSL_SECPREF_CREATE_DIRECTORY( integer) - Disallows creating directories.
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XSL_SECPREF_READ_NETWORK( integer) - Disallows reading network files.
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XSL_SECPREF_WRITE_NETWORK( integer) - Disallows writing network files.
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XSL_SECPREF_DEFAULT( integer) -
Disallows all write access, i.e. a bitmask of
XSL_SECPREF_WRITE_NETWORK|XSL_SECPREF_CREATE_DIRECTORY|XSL_SECPREF_WRITE_FILE.
