Ubuntu Unleashed 2013 Edition: Covering 12.10 and 13.04, Eighth Edition

Conditional Statements

In a conditional statement you instruct PHP to take different actions depending on the outcome of a test. For example, you might want PHP to check whether a variable is greater than 10 and, if so, print a message. This is all done with the if statement, which looks like this:

if (your condition) {  // action to take if condition is true} else {  // optional action to take otherwise}

The your condition part can be filled with any number of conditions you want PHP to evaluate, and this is where the comparison operators come into their own. For example:

if ($i > 10) {  echo "11 or higher";} else {  echo "10 or lower";}

PHP looks at the condition and compares $i to 10. If it is greater than 10, it replaces the whole operation ...