default keyword in php
The default keyword is used in the switch construct:
$value = 'A';switch ($value) {case 'A':case 'B': echo '$value is either A or B.';break;case 'C': echo '$value is C.';break;default: echo '$value is neither A, nor B, nor C.';}The default case matches anything that wasn’t matched by the other cases.
Adding to others answers:
default is a PHP keyword and keywords cannot be used as function name.
When you try:
function default () { ....}PHP expects to see a T_STRING ( an identifier) after the keyword function but sees a T_DEFAULT and flags a parse/syntax error:
unexpected T_DEFAULT, expecting T_STRING