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function names can be defined with letters, numbers and underscores. The underscore has no special meaning.

How ever with OOP, method names that begin with an underscore are treated a private functions, it was a coding convention back in PHP4.

 

If a variable has a slash in front of it, it is to prevent the variable form parsing in double quotes strings. For example

$var = 'hello';
echo "The value of \$var is: $var";
// outputs:  The value of $var is: hello
Edited by Ch0cu3r
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