Returns TRUE on success, FALSE otherwise.

Returns TRUE if successful otherwise returns FALSE.

Returns TRUE if no error occurs otherwise FALSE.

Returns TRUE if var is a float, FALSE otherwise.

Returns TRUE if var is an integer FALSE otherwise.

The function returns TRUE on success, or otherwise FALSE.

Returns TRUE if password is strong, or FALSE otherwise.

Returns TRUE if warnings is turned on otherwise FALSE.

These businesses would not be allowed to exist otherwise.

If an error occurs, returns 0, otherwise it returns 1.

Returns TRUE if a is a perfect square, FALSE otherwise.

Returns FALSE on error otherwise the new blob object id.

Return FALSE on error, otherwise the new blob object id.

Returns TRUE if value matches otherwise returns FALSE. Returns 1 on error.

Returns TRUE if the extension identified by name is loaded, FALSE otherwise.

Returns TRUE if var is a number or a numeric string, FALSE otherwise.

Returns TRUE if every character in text is a decimal digit, FALSE otherwise.

Adds an attribute to the object. Returns true on success and otherwise false.

Returns TRUE if the named constant given by name has been defined, FALSE otherwise.

Removes the attribute with the given name. Returns true on success and otherwise false.

If matches are found, the new subject will be returned, otherwise subject will be returned unchanged.

If the requested resource was opened successfully, you should return TRUE, otherwise you should return FALSE

Forces conversion to a double, the default floating point type. NULL values, Booleans, resources, longs, and of course doubles remain untouched. Strings containing a number are converted to their corresponding numeric representation, otherwise resulting in 0.0. Arrays and objects are converted to 0.0 if empty, 1.0 otherwise.

Returns TRUE if every character in text is printable, but neither letter, digit or blank, FALSE otherwise.

Returns TRUE if the gz file pointer is at EOF or an error occurs otherwise returns FALSE.

Upon success, returns 0 otherwise, returns 1. Note that seeking past EOF is not considered an error.

Forces conversion to a long, the default integer type. NULL values, Booleans, resources, and of course longs remain untouched. Doubles are truncated. Strings containing an integer are converted to their corresponding numeric representation, otherwise resulting in 0. Arrays and objects are converted to 0 if empty, 1 otherwise.

If the open fails, the function returns FALSE, otherwise it returns a pointer to the newly opened file.

Send the signal sig to the process with the process identifier pid. Returns FALSE, if unable to send the signal, TRUE otherwise.

Returns TRUE if every character in text has a special control function, FALSE otherwise. Control characters are e.g. line feed, tab, esc.

This function returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.

If you use this function, you must free the fonts obtained this way yourself and in reverse order. Otherwise your script will hang.

The table below shows the Streams equivalents of the more common ANSI stdio functions. Unless noted otherwise, the semantics of the functions are identical.

Returns TRUE if every character in text is a hexadecimal 'digit', that is a decimal digit or a character from A Fa f , FALSE otherwise.

Returns FALSE if connection is not a valid connection index, otherwise TRUE. Closes down the connection to a Hyperwave server with the given connection index.

Writes a string into the slob object. bid is a existing slob id and content the content to write. Return FALSE on error otherwise bytes written.

Reads nbytes of the slob object. bid is a existing slob id and nbytes is the number of bytes read. Return FALSE on error otherwise the string.

Returns the current file or seek position of an open slob object bid should be an existing slob id. Return FALSE on error otherwise the seek position.

Recode the file referenced by file handle input into the file referenced by file handle output according to the recode request. Returns FALSE, if unable to comply, TRUE otherwise.

Open text file for reading and writing. The file is created if it does not exist, otherwise it is truncated. The stream is positioned at the beginning of the file.

Returns TRUE if every character in text creates some sort of white space, FALSE otherwise. Besides the blank character this also includes tab, vertical tab, line feed, carriage return and form feed characters.

In the case everything went right, a valid font index will be returned and can be used for further purposes. Otherwise the function returns FALSE and prints a message describing what went wrong.

The optional parameter mode determines the unit length. If it's 0 or omitted the default unit as specified for the page is used. Otherwise the coordinates are measured in postscript points disregarding the current unit.

Return Value If language is set and language is valid, it returns TRUE. Otherwise, it returns FALSE. When language is omitted, it returns language name as string. If no language is set previously, it returns FALSE.

Returns a valid regular expression which will match string, ignoring case. This expression is string with each character converted to a bracket expression this bracket expression contains that character's uppercase and lowercase form if applicable, otherwise it contains the original character twice.