PHP

PHP and MySQL Tutorials - PHP

In this tutorial, we introduce the PHP scripting language. PHP is similar to high-level languages such as C, Perl, Pascal, FORTRAN, and Java, and programmers who have experience with any of these languages should have little trouble learning PHP. This tutorial serves as an introduction to PHP; it's not a programming guide. We assume you are already familiar with programming in a high-level language.

Table of content (tutorial index)

PHP PHP Basics Creating PHP scripts Outputting data with echo and print String literals Variables Expressions, Operators, and Variable Assignment Expressions Type Conversion Automatic type conversion Examining Variable Type and Content Testing, setting, and unsetting variables if...else Statement switch Statement Conditional Expressions while for Changing Loop Behavior A Working Example Creating Arrays Associative arrays Multidimensional arrays Using foreach Loops with Arrays Using Array Pointers Counting elements in arrays Finding values in arrays with in_array() and array_search() Reordering elements in arrays with array_reverse() Sorting with sort() and rsort() Sorting associative arrays Sorting on keys Sorting with user-defined element comparison String Literals Variable substitution Creating formatted output with sprintf() and printf() Padding strings Changing case Trimming whitespace Comparing Strings Extracting a substring from a string Finding the position of a substring Extracting a found portion of a string Extracting multiple values from a string Replacing substrings Translating characters and substrings Regular Expression Syntax, Characters and wildcards Character lists Optional and repeating characters Groups Escaping special characters Finding and extracting values Replacing substrings Generating a Timestamp Creating timestamps with mktime() and gmmktime() String to timestamp Subsecond times Formatting a Date Validating a Date Absolute Value Ceiling and Floor Number Systems Basic Trigonometry Functions Random Number Generation User-Defined Functions Variable Scope Global variables Passing arguments by reference Assigning by reference Reusing Functions with Include and Require Files Classes and Objects Inheritance A Page That Produces Partial or No Output Variable naming Missing output Complaints About Headers

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