Programming PHP

Appendix A APPENDIX A
Function Reference
This appendix describes the functions available in the standard PHP extensions.
These are the extensions that PHP is built with if you give no --with or --enable
options to configure. For each function, we’ve provided the function signature, showing
the data types of the various arguments and which are mandatory or optional, as
well as a brief description of the side effects, errors, and returned data structures.
PHP Functions by Category
This is a list of functions provided by PHP’s built-in extensions, grouped by category.
Some functions fall under more than one header.
Arrays
array, array_count_values, array_diff, array_filter, array_flip, array_
intersect, array_keys, array_map, array_merge, array_merge_recursive, array_
multisort, array_pad, array_pop, array_push, array_rand, array_reduce, array_
reverse, array_search, array_shift, array_slice, array_splice, array_sum,
array_unique, array_unshift, array_values, array_walk, arsort, asort, compact,
count, current, each, end, explode, extract, implode, in_array, key, key_exists,
krsort, ksort, list, natcasesort, natsort, next, pos, prev, range, reset, rsort,
shuffle, sizeof, sort, uasort, uksort, usort
Classes and objects
call_user_method, call_user_method_array, class_exists, get_class, get_class_
methods, get_class_vars, get_declared_classes, get_object_vars, get_parent_
class, is_subclass_of, method_exists
Date and time
checkdate, date, getdate, gettimeofday, gmdate, gmmktime, gmstrftime, localtime,
microtime, mktime, strftime, strtotime, time
Errors and logging
assert, assert_options, closelog, crc32, define_syslog_variables, error_log,
error_reporting, openlog, restore_error_handler, set_error_handler, syslog,
trigger_error, user_error
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