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trigger_error
Triggers error if 
$divisor
equals to 0
$divisor = false;
if ($divisor == 0) {
    trigger_error("Cannot divide by zero", E_USER_WARNING);
}
Possible second parameter values: 
E_USER_NOTICE
E_USER_WARNING
E_USER_ERROR
The second parameter defaults to E_USER_NOTICE
by Valeri Tandilashvili
4 years ago
PHP
functions
Object Oriented PHP Tutorial
2
Pro tip: use ```triple backticks around text``` to write in code fences