Incremental Operators - PHPWhat can you do without operators? Not much, if you're trying to do without them in a programming language, and PHP is no exception. On Monday, we barely had time to show you a long list of the operators in PHP. Today, we're going to show you what they do.
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Sometimes you want to increase or decrease the value of a variable by one. This is especially useful when using Loops, which we will cover in another tutorial. Here is an example of how you would work with them: <html> <body> <?php $value=9; echo $value; echo ++$value; ?> </body> </html> The above code results in this print-out: 9 10 When the ++ appears before the variable it adds a one to it. If a –- appears before a variable it subtracts one from it. Let's make it a little trickier. Consider the following code: <html> <body> <?php $value=9; echo $value; echo $value++; ?> </body> </html> This code would result in: 9 9 That is because when we place the ++ after the variable name, it increments the value after the line of code is executed. <html> <body> <?php $value=9; echo $value; echo $value++; // increments the value by one after the line echo $value; // prints the new value, which is now ten ?> </body> </html> This code prints: 9 9 10
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