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Array
Array Constants
- CASE_LOWER
- Used with array_change_key_case() to convert array keys to lower case
- CASE_UPPER
- Used with array_change_key_case() to convert array keys to upper case
- SORT_ASC
- Used with array_multisort() to sort in ascending order
- SORT_DESC
- Used with array_multisort() to sort in descending order
- SORT_REGULAR
- Used to compare items normally
- SORT_NUMERIC
- Used to compare items numerically
- SORT_STRING
- Used to compare items as strings
- SORT_LOCALE_STRING
- Used to compare items as strings, based on the current locale
- COUNT_NORMAL
- COUNT_RECURSIVE
- EXTR_OVERWRITE
- EXTR_SKIP
- EXTR_PREFIX_SAME
- EXTR_PREFIX_ALL
- EXTR_PREFIX_INVALID
- EXTR_PREFIX_IF_EXISTS
- EXTR_IF_EXISTS
- EXTR_REFS
String
String Constants
- CRYPT_SALT_LENGTH
- Contains the length of the default encryption method for the system. For standard DES encryption, the length is 2
- CRYPT_STD_DES
- Set to 1 if the standard DES-based encryption with a 2 character salt is supported, 0 otherwise
- CRYPT_EXT_DES
- Set to 1 if the extended DES-based encryption with a 9 character salt is supported, 0 otherwise
- CRYPT_MD5
- Set to 1 if the MD5 encryption with a 12 character salt starting with $1$ is supported, 0 otherwise
- CRYPT_BLOWFISH
- Set to 1 if the Blowfish encryption with a 16 character salt starting with $2$ or $2a$ is supported, 0 otherwise0
- HTML_SPECIALCHARS
- HTML_ENTITIES
- ENT_COMPAT
- ENT_QUOTES
- ENT_NOQUOTES
- CHAR_MAX
- LC_CTYPE
- LC_NUMERIC
- LC_TIME
- LC_COLLATE
- LC_MONETARY
- LC_ALL
- LC_MESSAGES
- STR_PAD_LEFT
- STR_PAD_RIGHT
- STR_PAD_BOTH
Date/Time
Date/Time Constants
- DATE_ATOM
- Atom (example: 2005-08-15T16:13:03+0000)
- DATE_COOKIE
- HTTP Cookies (example: Sun, 14 Aug 2005 16:13:03 UTC)
- DATE_ISO8601
- ISO-8601 (example: 2005-08-14T16:13:03+0000)
- DATE_RFC822
- RFC 822 (example: Sun, 14 Aug 2005 16:13:03 UTC)
- DATE_RFC850
- RFC 850 (example: Sunday, 14-Aug-05 16:13:03 UTC)
- DATE_RFC1036
- RFC 1036 (example: Sunday, 14-Aug-05 16:13:03 UTC)
- DATE_RFC1123
- RFC 1123 (example: Sun, 14 Aug 2005 16:13:03 UTC)
- DATE_RFC2822
- RFC 2822 (Sun, 14 Aug 2005 16:13:03 +0000)
- DATE_RSS
- RSS (Sun, 14 Aug 2005 16:13:03 UTC)
- DATE_W3C
- World Wide Web Consortium (example: 2005-08-14T16:13:03+0000)
Directory
Directory Constants
- DIRECTORY_SEPARATOR
- PATH_SEPARATOR
Error
Error Constants
- E_ERROR1
- Fatal run-time errors. Errors that cannot be recovered from. Execution of the script is halted
- E_WARNING2
- Non-fatal run-time errors. Execution of the script is not halted
- E_PARSE4
- Compile-time parse errors. Parse errors should only be generated by the parser
- E_NOTICE8
- Run-time notices. The script found something that might be an error, but could also happen when running a script normally
- E_CORE_ERROR16
- Fatal errors at PHP startup. This is like an E_ERROR in the PHP core
- E_CORE_WARNING32
- Non-fatal errors at PHP startup. This is like an E_WARNING in the PHP core
- E_COMPILE_ERROR64
- Fatal compile-time errors. This is like an E_ERROR generated by the Zend Scripting Engine
- E_COMPILE_WARNING128
- Non-fatal compile-time errors. This is like an E_WARNING generated by the Zend Scripting Engine
- E_USER_ERROR256
- Fatal user-generated error. This is like an E_ERROR set by the programmer using the PHP function trigger_error()
- E_USER_WARNING512
- Non-fatal user-generated warning. This is like an E_WARNING set by the programmer using the PHP function trigger_error()
- E_USER_NOTICE1024
- User-generated notice. This is like an E_NOTICE set by the programmer using the PHP function trigger_error()
- E_STRICT2048
- Run-time notices. PHP suggest changes to your code to help interoperability and compatibility of the code
- E_RECOVERABLE_ERROR4096
- Catchable fatal error. This is like an E_ERROR but can be caught by a user defined handle (see also set_error_handler())
- E_ALL6143
- All errors and warnings, except of level E_STRICT
Math
Math Constants
- M_E
- Returns e (approx. 2.718)
- M_EULER
- Returns Euler's constant (approx. 0.577)
- M_LNPI
- Returns the natural logarithm of PI (approx. 1.144)
- M_LN2
- Returns the natural logarithm of 2 (approx. 0.693)
- M_LN10
- Returns the natural logarithm of 10 (approx. 2.302)
- M_LOG2E
- Returns the base-2 logarithm of E (approx. 1.442)
- M_LOG10E
- Returns the base-10 logarithm of E (approx. 0.434)
- M_PI
- Returns PI (approx. 3.14159)
- M_PI_2
- Returns PI/2 (approx. 1.570)
- M_PI_4
- Returns PI/4 (approx. 0.785)
- M_1_PI
- Returns 1/PI (approx. 0.318)
- M_2_PI
- Returns 2/PI (approx. 0.636)
- M_SQRTPI
- Returns the square root of PI (approx. 1.772)
- M_2_SQRTPI
- Returns 2/square root of PI (approx. 1.128)
- M_SQRT1_2
- Returns the square root of 1/2 (approx. 0.707)
- M_SQRT2
- Returns the square root of 2 (approx. 1.414)
- M_SQRT3
- Returns the square root of 3 (approx. 1.732)
Filesystem
Filesystem Constants
- GLOB_BRACE
- GLOB_ONLYDIR
- GLOB_MARK
- GLOB_NOSORT
- GLOB_NOCHECK
- GLOB_NOESCAPE
- PATHINFO_DIRNAME
- PATHINFO_BASENAME
- PATHINFO_EXTENSION
- FILE_USE_INCLUDE_PATH
- FILE_APPEND
- FILE_IGNORE_NEW_LINES
- FILE_SKIP_EMPTY_LINES
Calendar
Calendar Constants
- CAL_GREGORIAN
- Gregorian calendar
- CAL_JULIAN
- Julian calendar
- CAL_JEWISH
- Jewish calendar
- CAL_FRENCH
- French Republican calendar
- CAL_NUM_CALS
- CAL_DOW_DAYNO
- CAL_DOW_SHORT
- CAL_DOW_LONG
- CAL_MONTH_GREGORIAN_SHORT
- CAL_MONTH_GREGORIAN_LONG
- CAL_MONTH_JULIAN_SHORT
- CAL_MONTH_JULIAN_LONG
- CAL_MONTH_JEWISH
- CAL_MONTH_FRENCH
- CAL_EASTER_DEFAULT
- CAL_EASTER_ROMAN
- CAL_EASTER_ALWAYS_GREGORIAN
- CAL_EASTER_ALWAYS_JULIAN
- CAL_JEWISH_ADD_ALAFIM_GERESH
- CAL_JEWISH_ADD_ALAFIM
- CAL_JEWISH_ADD_GERESHAYIM
FTP
FTP Constants
- FTP_ASCII
- FTP_TEXT
- FTP_BINARY
- FTP_IMAGE
- FTP_TIMEOUT_SEC
- FTP_AUTOSEEK
- FTP_AUTORESUME
- Determine resume position and start position for get and put requests automatically
- FTP_FAILED
- Asynchronous transfer has failed
- FTP_FINISHED
- Asynchronous transfer has finished
- FTP_MOREDATA
- Asynchronous transfer is still active
Libxml
Libxml Constants
- LIBXML_COMPACT
- Set small nodes allocation optimization. This may improve the application performance
- LIBXML_DTDATTR
- Set default DTD attributes
- LIBXML_DTDLOAD
- Load external subset
- LIBXML_DTDVALID
- Validate with the DTD
- LIBXML_NOBLANKS
- Remove blank nodes
- LIBXML_NOCDATA
- Set CDATA as text nodes
- LIBXML_NOEMPTYTAG
- Change empty tags (e.g. <br/> to <br></br>), only available in the DOMDocument->save() and DOMDocument->saveXML() functions
- LIBXML_NOENT
- Substitute entities
- LIBXML_NOERROR
- Do not show error reports
- LIBXML_NONET
- Stop network access while loading documents
- LIBXML_NOWARNING
- Do not show warning reports
- LIBXML_NOXMLDECL
- Drop the XML declaration when saving a document
- LIBXML_NSCLEAN
- Remove excess namespace declarations
- LIBXML_XINCLUDE
- Use XInclude substitution
- LIBXML_ERR_ERROR
- Get recoverable errors
- LIBXML_ERR_FATAL
- Get fatal errors
- LIBXML_ERR_NONE
- Get no errors
- LIBXML_ERR_WARNING
- Get simple warnings
- LIBXML_VERSION
- Get libxml version (e.g. 20605 or 20617)
- LIBXML_DOTTED_VERSION
- Get dotted libxml version (e.g. 2.6.5 or 2.6.17)
Misc.
Misc. Constants
- CONNECTION_ABORTED
- CONNECTION_NORMAL
- CONNECTION_TIMEOUT
- __COMPILER_HALT_OFFSET__
XML Parser
XML Parser Constants
- XML_ERROR_NONE (integer)
- XML_ERROR_NO_MEMORY (integer)
- XML_ERROR_SYNTAX (integer)
- XML_ERROR_NO_ELEMENTS (integer)
- XML_ERROR_INVALID_TOKEN (integer)
- XML_ERROR_UNCLOSED_TOKEN (integer)
- XML_ERROR_PARTIAL_CHAR (integer)
- XML_ERROR_TAG_MISMATCH (integer)
- XML_ERROR_DUPLICATE_ATTRIBUTE (integer)
- XML_ERROR_JUNK_AFTER_DOC_ELEMENT (integer)
- XML_ERROR_PARAM_ENTITY_REF (integer)
- XML_ERROR_UNDEFINED_ENTITY (integer)
- XML_ERROR_RECURSIVE_ENTITY_REF (integer)
- XML_ERROR_ASYNC_ENTITY (integer)
- XML_ERROR_BAD_CHAR_REF (integer)
- XML_ERROR_BINARY_ENTITY_REF (integer)
- XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF (integer)
- XML_ERROR_MISPLACED_XML_PI (integer)
- XML_ERROR_UNKNOWN_ENCODING (integer)
- XML_ERROR_INCORRECT_ENCODING (integer)
- XML_ERROR_UNCLOSED_CDATA_SECTION (integer)
- XML_ERROR_EXTERNAL_ENTITY_HANDLING (integer)
- XML_OPTION_CASE_FOLDING (integer)
- XML_OPTION_TARGET_ENCODING (integer)
- XML_OPTION_SKIP_TAGSTART (integer)
- XML_OPTION_SKIP_WHITE (integer)