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ID: 118
Viewed: 2998
Added: Apr 14, 2002
Version:
Snippet uploaded by: Ric Mitchell
Written By: Ric Mitchell
Demo: Sorry, no demo



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This is a function, that will return false if the string passed to it is not alphanumeric, and true if it is.

<!---Head--->
none

<!---Body--->


 <?

function alphanumeric($string) {
$alphachars[0] = "9";
$alphachars[1] = "a";
$alphachars[2] = "b";
$alphachars[3] = "c";
$alphachars[4] = "d";
$alphachars[5] = "e";
$alphachars[6] = "f";
$alphachars[7] = "g";
$alphachars[8] = "h";
$alphachars[9] = "i";
$alphachars[10] = "j";
$alphachars[11] = "k";
$alphachars[12] = "l";
$alphachars[13] = "m";
$alphachars[14] = "n";
$alphachars[15] = "o";
$alphachars[16] = "p";
$alphachars[17] = "q";
$alphachars[18] = "r";
$alphachars[19] = "s";
$alphachars[20] = "t";
$alphachars[21] = "u";
$alphachars[22] = "v";
$alphachars[23] = "w";
$alphachars[24] = "x";
$alphachars[25] = "y";
$alphachars[26] = "z";
$alphachars[27] = "0";
$alphachars[28] = "1";
$alphachars[29] = "2";
$alphachars[30] = "3";
$alphachars[31] = "4";
$alphachars[32] = "5";
$alphachars[33] = "6";
$alphachars[34] = "7";
$alphachars[35] = "8";
for ($i=0;$i<strlen($string);$i++) {
for ($j=0;$j<36;$j++) {
if(strtolower(substr($string, $i, 1)) == $alphachars[$j]) {
$charok == 1;
}
}
if (!$charok) {
return false;
}
$charok = NULL;
}
return true;
}

?>


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