- strstr: documentation ( source)
- var_export: documentation ( source)
<?php
$tests = ['1,23,45,123,145,200', '345,999,0,1', '0', '0,2', '-1,-122', '', '1.5,2.9'];
foreach ($tests as $test) {
$before_comma = strstr($test, ',', true);
var_export($before_comma === false ? $test : $before_comma);
echo "\n";
}