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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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