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@ 2020-01-31T09:31:56Z

<?php

$myVariable1  = '2345';
$myVariable2  = 4433;
$myVariable3  = 'test';
$myVariable4  = '1345.33';
function makeInteger($val){
    return is_numeric($val) ? (int)$val : null;
}
for($i=1;$i<=4;$i++){ 
    echo makeInteger(${"myVariable".$i}).PHP_EOL; 
}

Output
Performance
VLD
References
Branches

is_numeric: documentation ( source)

preferences:dark modelive previewkey bindings

29.01 ms | 404 KiB | 5 Q