Question

How to determines whether a character is a letter or a digit in PHP

Answer 1

$n = '9';
if (ctype_alpha($n) || is_numeric($n))
    echo "yes<br />";
else
    echo "no<br />";

$n = 'a';
if (ctype_alpha($n) || is_numeric($n))
    echo "yes<br />";
else
    echo "no<br />";
    
$n = '@';
if (ctype_alpha($n) || is_numeric($n))
    echo "yes<br />";
else
    echo "no<br />";
    
 
/*
run:
  
yes
yes
no
  
*/

 

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