PHP built-in functions

Abs: Get absolute value.

Acos: Gets the inverse cosine value.
Ada_afetch: Gets the returned column of the database.
Ada_autocommit: Switch automatic change function.
Ada_close: Close Adabas D link.
Ada_commit: Change Adabas D database.
Ada_connect: Link to Adabas D database.
Ada_exec: Executes the SQL instruction.
Ada_fetchrow: Gets a column returned.
Ada_fieldname: Gets the field name.
Ada_fieldtype: Get field data form.
Ada_freeresult: Releases the memory that is transmitted back to the data.
Ada_numfields: Gets the number of fields.
Ada_numrows: Gets the number of returned columns.
Ada_result: Obtain the data returned.
Ada_resultall: Returns HTML table data.
Ada_rollback: Undoes the current transaction.
Addslashes: String join Slash.
Apache_lookup_uri: Get all the URI related information.
Apache_note: Obtains and sets the request record of the Apache server.
Array: Create a new array.
Array_walk: Allows the user to customize the function to handle each element in the array.
Arsort: Sorts the values of the array from large to small.
Asin: Gets the inverse sine value.
Asort: Sorts the values of the array from small to large.
Aspell_check: Check for a word.
Aspell_check-raw: Check a word, even if the spelling is not changed or corrected.
Aspell_new: Loads a new dictionary.
Aspell_suggest: Check a word and provide spelling suggestions.
Atan: Gets the inverse tangent value.
Atan2: Calculates the inverse tangent of two numbers.
Base64_decode: Decodes the BASE64 encoded string.
Base64_encode: Encodes the string as BASE64.
basename: Returns a file string without a path.
Base_convert: Converts the carry mode of a number.
Bcadd: Adds two high-precision numbers.
Bccomp: Comparison of two high-precision numbers.
Bcdiv: Divides two high-precision numbers.
Bcmod: The remainder of the high-precision number is obtained.
Bcmul: Multiplies two high-precision numbers.
Bcpow: To find a high-precision digital square value.
Bcscale: Sets the default number of decimal places for all BC function libraries in the program.
BCSQRT: To find the square root of a high-precision number.
Bcsub: Subtract two high-precision digits.
Bin2Hex: binary turns into 16 decimal.
Bindec: binary turns into 10 decimal.
Ceil: Calculates the smallest integer greater than the specified number.
ChDir: Change directory.
Checkdate: Verify the correctness of the date.
CHECKDNSRR: Check DNS records for the specified URLs.
CHGRP: Change the group to which the file belongs.
chmod: Change the properties of the file.
Chop: Remove continuous whitespace.
Chown: Change the owner of the file.
CHR: A character that returns an ordinal value.
Chunk_split: Divides the string into small segments.
Clearstatcache: Clears the file status cache.
Closedir: Close directory handle.
Closelog: Shut down the system record.
Connection_aborted: Returns True if the link is interrupted.
Connection_status: Get the connection status.
Connection_timeout: Returns True if the execution time of the PHP program is exceeded.
Convert_cyr_string: Convert Cyrillic strings into other strings.
Copy: Copies the file.
COS: cosine calculation.
Count: Calculates the number of elements in a variable or array.
Crypt: The string is encrypted with DES encoding.
Current: Returns the existing element in the array.
Date: Formats the time of the server.
Dbase_add_record: Add data to the DBase data sheet.
Dbase_close: Close the DBase table.
Dbase_create: Establishes a dBase data table.
Dbase_delete_record: Delete data from dBase tables.
Dbase_get_record: Access to dBase data sheets.
Dbase_numfields: Gets the number of fields in the DBase data table.
Dbase_numrecords: Gets the number of columns in the DBase table.
Dbase_open: Open dBase data table.
Dbase_pack: Clean up dBase tables.
Dba_close: Close the repository.
Dba_delete: Deletes the specified data.
Dba_exists: Checks if the key exists.
Dba_fetch: Retrieve the specified information.
Dba_firstkey: Take back the pen key value.
Dba_insert: Add data.
Dba_nextkey: Retrieve the Pen key value.
Dba_open: Open the database link.
Dba_optimize: Optimized database.
Dba_popen: Open and keep the database linked.
Dba_replace: Alter or add information.
Dba_sync: Synchronization of databases.
DBList: Get information for DBM.
Dbmclose: Close the DBM repository.
Dbmdelete: Deletes the specified data.
Dbmexists: Checks if the key exists.
Dbmfetch: Retrieve the specified information.
Dbmfirstkey: Take back the pen key name.
Dbminsert: Add data.
Dbmnextkey: Retrieve the Pen key value.
Dbmopen: Turn on the DBM repository link.
Dbmreplace: Alter or add information.
Debugger_off: Close the built-in PHP debugger.
DEBUGGER_ON: Use the built-in PHP debugger.
Decbin: the decimal binary.
Dechex: Decimal Turn 16.
DECOCT: Decimal turn octal.
Delete: a useless item.
Die: Outputs the message and interrupts the PHP program.
Dir: Directory Category object.
DirName: Gets the directory name in the path.
Diskfreespace: Gets the remaining free space where the directory resides.
DL: Load PHP expansion module.
Doubleval: variable to multiply number of floating point type.
Each: Returns the index and value of the next element in the array.
Easter_date: Calculates the Easter date.
Easter_days: Calculates the number of dates between Easter and March 21.
Echo: Output string.
Empty: Determines whether the variable is set.
End: Refers to the internal indicator of the array to the last element.
Ereg: Parsing of string ratios.
Eregi: string comparison analysis, and case-insensitive.
Eregi_replace: string comparison is parsed and replaced, regardless of the case.
Ereg_replace: The string comparison is parsed and replaced.
Error_log: Send out an error message.
Error_reporting: Sets the level of return for error messages.
Escapeshellcmd: Removes the extraordinary symbol from the string.
Eval: Converts the value into a string.
EXEC: Executes an external program.
Exit: Ends the PHP program.
EXP: The secondary value of the natural logarithm E.
Explode: Cut the string.
Extract: Sinks the array into the symbol table.
Fclose: Closes the file that is already open.
Fdf_close: Close the FDF file.
Fdf_create: Create a new FDF file.
Fdf_get_file: Gets the value of the/F key.
Fdf_get_status: Gets the value of the/status key.

PHP built-in functions