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<?php $strings = [ ' 1 ', '+1', '1e9', ]; foreach ($strings as $string) { echo "'", $string, "': ", is_numeric($string) ? 'yes' : 'no', "\n"; $string = str_repeat($string, 2); echo "'", $string, "': ", is_numeric($string) ? 'yes' : 'no', "\n\n"; }
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
' 1 ': yes ' 1 1 ': no '+1': yes '+1+1': no '1e9': yes '1e91e9': no
preferences:
53.16 ms | 402 KiB | 62 Q