Programming PHP [missing chapter 1] by Rasmus Lerdorf; et al

By Rasmus Lerdorf; et al

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There are two ways to use autoincrement or autodecrement in expressions. If you put the operator in front of the operand, it returns the new value of the operand (incremented or decremented). If you put the operator after the operand, it returns the original value of the operand (before the increment or decrement). Table 2-5 lists the different operations. Table 2-5. Autoincrement and autodecrement operations Operator Name Value returned Effect on $var $var++ Post-increment $var Incremented ++$var Pre-increment $var + 1 Incremented $var-- Post-decrement $var Decremented --$var Pre-decrement $var – 1 Decremented These operators can be applied to strings as well as numbers.

For example, here’s a function that updates a local variable instead of a global variable: function update_counter ( ) { $counter++; } Variables | This is the Title of the Book, eMatter Edition Copyright © 2002 O’Reilly & Associates, Inc. All rights reserved. 15294 Page 32 Wednesday, March 13, 2002 11:42 AM $counter = 10; update_counter( ); echo $counter; 10 The $counter inside the function is local to that function, because we haven’t said otherwise. The function increments its private $counter, whose value is thrown away when the subroutine ends.

For example: $foo = 'bar'; $$foo = 'baz'; After the second statement executes, the variable $bar has the value "baz". Variable References In PHP, references are how you create variable aliases. To make $black an alias for the variable $white, use: $black =& $white; 30 | Chapter 2: Language Basics This is the Title of the Book, eMatter Edition Copyright © 2002 O’Reilly & Associates, Inc. All rights reserved. 15294 Page 31 Wednesday, March 13, 2002 11:42 AM The old value of $black is lost. "; print "\$short is $short\n"; print "Long is $big_long_variable_name\n"; $short is PHP rocks!

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