The ReflectionExtension::getConstants() function is an inbuilt function in PHP which is used to return an associative array with constant names as keys.
Syntax:
array ReflectionExtension::getConstants( void )
Parameters: This function does not accept any parameter.
Return Value: This function returns an associative array with constant names as keys.
Below programs illustrate the ReflectionExtension::getConstants() function in PHP:
Program 1:
<?php   // Using ReflectionExtension() over // an extension xml $extension = new ReflectionExtension('xml');   // Calling the getConstants() function and // Getting an array with constant names as keys. var_dump($extension->getConstants()); ?> |
Output:
array(45) {
["XML_ELEMENT_NODE"]=>
int(1)
["XML_ATTRIBUTE_NODE"]=>
int(2)
["XML_TEXT_NODE"]=>
int(3)
["XML_CDATA_SECTION_NODE"]=>
int(4)
["XML_ENTITY_REF_NODE"]=>
int(5)
["XML_ENTITY_NODE"]=>
int(6)
["XML_PI_NODE"]=>
int(7)
["XML_COMMENT_NODE"]=>
int(8)
["XML_DOCUMENT_NODE"]=>
int(9)
["XML_DOCUMENT_TYPE_NODE"]=>
int(10)
["XML_DOCUMENT_FRAG_NODE"]=>
int(11)
["XML_NOTATION_NODE"]=>
int(12)
["XML_HTML_DOCUMENT_NODE"]=>
int(13)
["XML_DTD_NODE"]=>
int(14)
["XML_ELEMENT_DECL_NODE"]=>
int(15)
["XML_ATTRIBUTE_DECL_NODE"]=>
int(16)
["XML_ENTITY_DECL_NODE"]=>
int(17)
["XML_NAMESPACE_DECL_NODE"]=>
int(18)
["XML_LOCAL_NAMESPACE"]=>
int(18)
["XML_ATTRIBUTE_CDATA"]=>
int(1)
["XML_ATTRIBUTE_ID"]=>
int(2)
["XML_ATTRIBUTE_IDREF"]=>
int(3)
["XML_ATTRIBUTE_IDREFS"]=>
int(4)
["XML_ATTRIBUTE_ENTITY"]=>
int(6)
["XML_ATTRIBUTE_NMTOKEN"]=>
int(7)
["XML_ATTRIBUTE_NMTOKENS"]=>
int(8)
["XML_ATTRIBUTE_ENUMERATION"]=>
int(9)
["XML_ATTRIBUTE_NOTATION"]=>
int(10)
["DOM_PHP_ERR"]=>
int(0)
["DOM_INDEX_SIZE_ERR"]=>
int(1)
["DOMSTRING_SIZE_ERR"]=>
int(2)
["DOM_HIERARCHY_REQUEST_ERR"]=>
int(3)
["DOM_WRONG_DOCUMENT_ERR"]=>
int(4)
["DOM_INVALID_CHARACTER_ERR"]=>
int(5)
["DOM_NO_DATA_ALLOWED_ERR"]=>
int(6)
["DOM_NO_MODIFICATION_ALLOWED_ERR"]=>
int(7)
["DOM_NOT_FOUND_ERR"]=>
int(8)
["DOM_NOT_SUPPORTED_ERR"]=>
int(9)
["DOM_INUSE_ATTRIBUTE_ERR"]=>
int(10)
["DOM_INVALID_STATE_ERR"]=>
int(11)
["DOM_SYNTAX_ERR"]=>
int(12)
["DOM_INVALID_MODIFICATION_ERR"]=>
int(13)
["DOM_NAMESPACE_ERR"]=>
int(14)
["DOM_INVALID_ACCESS_ERR"]=>
int(15)
["DOM_VALIDATION_ERR"]=>
int(16)
}
Program 2:
Output:
array(27) {
["XML_ERROR_NONE"]=>
int(0)
["XML_ERROR_NO_MEMORY"]=>
int(1)
["XML_ERROR_SYNTAX"]=>
int(2)
["XML_ERROR_NO_ELEMENTS"]=>
int(3)
["XML_ERROR_INVALID_TOKEN"]=>
int(4)
["XML_ERROR_UNCLOSED_TOKEN"]=>
int(5)
["XML_ERROR_PARTIAL_CHAR"]=>
int(6)
["XML_ERROR_TAG_MISMATCH"]=>
int(7)
["XML_ERROR_DUPLICATE_ATTRIBUTE"]=>
int(8)
["XML_ERROR_JUNK_AFTER_DOC_ELEMENT"]=>
int(9)
["XML_ERROR_PARAM_ENTITY_REF"]=>
int(10)
["XML_ERROR_UNDEFINED_ENTITY"]=>
int(11)
["XML_ERROR_RECURSIVE_ENTITY_REF"]=>
int(12)
["XML_ERROR_ASYNC_ENTITY"]=>
int(13)
["XML_ERROR_BAD_CHAR_REF"]=>
int(14)
["XML_ERROR_BINARY_ENTITY_REF"]=>
int(15)
["XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF"]=>
int(16)
["XML_ERROR_MISPLACED_XML_PI"]=>
int(17)
["XML_ERROR_UNKNOWN_ENCODING"]=>
int(18)
["XML_ERROR_INCORRECT_ENCODING"]=>
int(19)
["XML_ERROR_UNCLOSED_CDATA_SECTION"]=>
int(20)
["XML_ERROR_EXTERNAL_ENTITY_HANDLING"]=>
int(21)
["XML_OPTION_CASE_FOLDING"]=>
int(1)
["XML_OPTION_TARGET_ENCODING"]=>
int(2)
["XML_OPTION_SKIP_TAGSTART"]=>
int(3)
["XML_OPTION_SKIP_WHITE"]=>
int(4)
["XML_SAX_IMPL"]=>
string(6) "libxml"
}
Reference: https://www.php.net/manual/en/reflectionextension.getconstants.php
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