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Defines a named constant
Defines a named constant at runtime.
*Parameters
-name: the name of the constant.
-value: The value of the constant; only scalar and null values are allowed. Scalar values are integer, float, string or boolean values.
-case_insensitive: If set to true, the constant will be defined case_insensitive. The default behavior is case-sensitive; i.e. CONSTANT and Constant represent different values.
*Return value
-When it succeed, return true. On the contrary, return false.
Example:
<?php
define("CONSTANT", "Hello world.");
echo CONSTANT; // "Hello world."
echo Constant; // just output "Constant" with noticing issues.
define("GREETING", "Hello you.", true);
echo GREETING; // outputs "Hello you."
echo Greeting; // outputs "Hello you."
?>
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