PHP & MySQL®: Your visual blueprint™ for creating dynamic, database-driven Web sites

Chapter 4. Controlling the Flow of the Script

Change the Order of Statement Execution

PHP scripts are a series of instructions in a file. PHP begins at the top of the file and executes each instruction in order. Sometimes you want your statements to execute in a different order, such as executing a statement only when certain conditions exist or executing a statement more than once. PHP provides several complex statements that change the order of execution in your script.

Conditional Statements

Conditional statements execute a block of statements only when certain conditions are met. The most common conditional statement is the if statement, which tests a condition and executes a block of code when the condition is true. An if statement can also ...