Undocumented functions
Despite the fact that the PHP documentation team works around the clock to document the language and all its functions (and do a remarkably good job!), there are still some functions you will not find in the PHP manual. That is not to say they are unimportant, just that either very few people know how to use them, or that no one has had enough time to get around to them yet.
Although I have covered several of these functions in this book, there are probably many dozen more still around. Sometimes the only way to be certain is to look up the source code yourself.
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Jump to: Functions Functions overview How to read function prototypes Working with variables Controlling script execution Working with Date and Time Reading the current time Converting from a string Converting to a string Converting from components Mathematics Rounding Randomisation Trigonometrical conversion Other mathematical conversion functions Base conversion Mathematical constants Playing with strings Reading from part of a string Replacing parts of a string Converting to and from ASCII Measuring strings Finding a string within a string Returning the first occurrence of a string Trimming whitespace Wrapping your lines Changing string case Making a secure data hash Alternative data hashing Automatically escaping strings Pretty-printing numbers Removing HTML from a string Comparing strings Padding out a string Complex string printing Parsing a string into variables Regular expressions Basic regexps with preg_match() and preg_match_all() Novice regexps Advanced regexps Guru regexps Regular expression replacements Regular expression syntax examples The regular expressions coach Checking whether a function is available Extension functions Pausing script execution Executing external programs Connection-related functions Altering the execution environment User functions Return values Parameters Passing by reference Returning by reference Default parameters Variable parameter counts Variable scope in functions Overriding scope with the GLOBALS array Recursive functions Variable functions Callback functions The declare() function and ticks Handling non-English characters Undocumented functions Summary Exercises Further reading Next chapter
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