Variable functions on PHP
PHP supports the concept of variable functions. This means that if a variable name has parentheses appended to it, PHP will look for a function
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Returning values
Values are returned by using the optional return statement. Any type may be returned, including arrays and objects. This causes the function to end its
Function arguments
Information may be passed to functions via the argument list, which is a comma-delimited list of expressions. PHP supports passing arguments by value (the default),
Example , Recursive functions on PHP
<?php function recursion($a) { if ($a < 20) { echo «$a\n»; recursion($a + 1); } } ?>
Example , Functions within functions
<?php function foo() { function bar() { echo «I don’t exist until foo() is called.\n»; } } /* We can’t call bar() yet since it
example ,Conditional functions on PHP
<?php $makefoo = true; /* We can’t call foo() from here since it doesn’t exist yet, but we can call bar() */ bar(); if ($makefoo)
include function on PHP
The include() statement includes and evaluates the specified file. The documentation below also applies to require(). Files are included based on the file path given
require on PHP
require() is identical to include() except upon failure it will also produce a fatal E_COMPILE_ERROR level error. In other words, it will halt the script
return on PHP
If called from within a function, the return() statement immediately ends execution of the current function, and returns its argument as the value of the
declare
The declare construct is used to set execution directives for a block of code. The syntax of declare is similar to the syntax of other