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+--- Thread: A question about load_class function in Common.php (/showthread.php?tid=42646)
A question about load_class function in Common.php - El Forum - 06-14-2011
[eluser]Crusoe[/eluser]
In this block of code
Code:
static $_classes = array();
// Does the class exist? If so, we're done...
if (isset($_classes[$class]))
{
return $_classes[$class];
}The $isset test not make any sense. Can someone explain this please ?
A question about load_class function in Common.php - El Forum - 06-14-2011
[eluser]danmontgomery[/eluser]
It's checking if the class has already been loaded, in which case it doesn't load it again.
A question about load_class function in Common.php - El Forum - 06-14-2011
[eluser]Crusoe[/eluser]
The if (isset($_classes[$class])) will always return false because the array is being initialised in the previous line. It's meaningless to have that isset test there.
A question about load_class function in Common.php - El Forum - 06-14-2011
[eluser]danmontgomery[/eluser]
[quote author="Crusoe" date="1308065319"]The if (isset($_classes[$class])) will always return false because the array is being initialised in the previous line. It's meaningless to have that isset test there.[/quote]
http://php.net/manual/en/language.variables.scope.php
Quote:A static variable exists only in a local function scope, but it does not lose its value when program execution leaves this scope.
A question about load_class function in Common.php - El Forum - 06-14-2011
[eluser]Crusoe[/eluser]
Ah. I see what you mean.
Code:
static $arry = array();
$arry['a'] = 'hello world';
static $arry = array();
if(isset($arry['a'])) {
print $arry['a'];
}prints "hello world"
I am new to PHP (uses C++ and C# mostly). Just getting used to PHP's peculiarities
Thanks.