Appendix A. Function List
This appendix lists all of the descriptions and declarations of the functions in this book. The declaration is described as follows:
returnType FunctionName(varType variable1, varType variable2,. . .)All of the functions follow this pattern. If the function returns nothing, the return type is void. If the parameter is optional, brackets are placed around the parameter.
| Name | Description | Code |
|---|---|---|
| basename() | Returns the filename component of a filename string. | string basename(string $fullString) |
| copy() | Copies the contents of one file to another. | bool copy(string $source_filename, string $destination_filename) |
| define() | Takes in a constant name and a constant value and defines the constant in the program. | void define(string $constantName, int constantValue); |
| echo | Although this is not a function (it is a language construct), it acts as one. Outputs the specified text or variable to the page. | void echo (string $1, . . .) |
| exit | Although this is not a function (it is a language construct), it acts as one. Causes the PHP page to immediately halt script execution. No following PHP commands are executed on the page. | void exit (string/int $status); |
| fclose() | Closes a file. | void fclose(resource $handle); |
| filesize() | Returns the size of a file in bytes. | int filesize(string $filename); |
| fopen() | Opens a file and returns a handle to it. | resource fopen(string $filename, string $mode) |
| fread() | Returns a string that contains all the contents inside the chosen file. | string fread(resource $handle, int $sizeInBytes); |
| fwrite() | Writes a string to an already opened file. | bool fwrite(resource $handle, string $text); |
| gettype() | Returns the type of the inputted variable. | string gettype(anytype $variable); |
| header() | Allows you to modify some section | void header(string $newLocation); of the document header. Using the Location: attribute changes the web page’s URL. |
| isset() | Confirms whether a variable has been created. Returns true if it already exists and false if not. | bool isset(anytype $variable); |
| mail() | Lets your web server send an email message. | bool mail(string $to, string $subject, string $message, [string $additionalheaders], [string $additionalparameters]) |
| move_uploaded_file() | Moves a file from its temporary location to its final destination on your server. | bool move_uploaded_file (string $source, string $destination); |
| nl2br() | Takes in a string as a parameter and converts the new lines into <br /> tags. Allows proper display of strings in the web browser. | string nl2br(string $text); |
| rename() | Renames a file. | bool rename(string $old_filename, string $new_filename); |
| session_name() | Allows you to assign a name to your session. Includes a string parameter to change the name. If you leave the parameter blank, the current session’s name is returned. | string session_name ([string $name]); |
| session_ start() | Initiates or continues using a session. This function must be placed before any other echoed HTML or text. | void session_start(void); |
| setcookie() | Sets a cookie on the web server, which lets you store user data. | bool setcookie(string, $name, [string $value, int $expire, string $path, string $domain, bool $secure]) |
| stripslashes() | Returns a string with all backslashes removed. | string stripslashes(string $orginalString); |
| strval() | Takes in a non-string as a parameter and returns the input as a string value. | string strval(int $nonstring); |
| time() | Returns the number of seconds since the epoch (returns the current time). | int time(void); |
| unlink() | Deletes a file. | bool unlink(string $filename) |
| unset() | Deletes an element of an array or an entire array, depending on what variable you pass. | void unset(anytype $elementOrArray); |
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