know type of variable php code example

Example 1: getttype php

gettype ( mixed $var ) : string

gettype ("SALUT") => string
gettype (2) => integer    
  ...etc ...
  
"bool"
"integer"
"double"
"array"
"object"
"resource"
"NULL"
"unknown type"

Example 2: check type in php

gettype ( mixed $var ) : string