Programming PHP

chown
bool chown(string path, mixed user)
Changes ownership for the file path to the user named user. PHP must have appropriate
privileges (generally, root for this function) for the function to operate. Returns true if the
change was successful and false if not.
chr
string chr(int char)
Returns a string consisting of the single ASCII character char.
chroot
bool chroot(string path)
Changes the root directory of the current process to path. You cannot use chroot( ) to
restore the root directory to / when running PHP in a web server environment. Returns
true if the change was successful and false if not.
chunk_split
string chunk_split(string string[, int size[, string postfix]])
Inserts postfix into string every size characters and at the end of the string; returns the
resulting string. If not specified, postfix defaults to \r\n and size defaults to 76. This function
is most useful for encoding data to the RPF 2045 standard. For example:
$data = "...some long data...";
$converted = chunk_split(base64_encode($data));
class_exists
bool class_exists(string name)
Returns true if a class with the same name as the string has been defined; if not, it returns
false. The comparison for class names is case-insensitive.
clearstatcache
void clearstatcache( )
Clears the file status functions cache. The next call to any of the file status functions will
retrieve the information from the disk.
388 | Appendix A: Function Reference
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