I have tried to find a way to check if a character string is possible to
test whether it is convertible to an intger !

any suggestion ?

BR georg

All responses in this thread have been very nice; but you could also try a much simpler 2-step check:

1. is_numeric
2. if true > check if there's a decimal character in the string:

if(is_numeric($str) && false === strpos('.', $str)) {
   // it's an int for sure
} else {
   // might be a number, but it's definitly not an int

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