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Incrementing alphanumeric strings in PHP
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function alphanumeric_increment( $string, $position=false ) { | |
if ( false === $position ) { | |
$position = strlen( $string ) - 1; | |
} | |
$increment_str = substr( $string, $position, 1 ); | |
switch ( $increment_str ) { | |
case '9': | |
$string = substr_replace( $string, 'a', $position, 1 ); | |
break; | |
case 'z': | |
$string = substr_replace( $string, 'A', $position, 1 ); | |
break; | |
case 'Z': | |
if ( 0 === $position ) { | |
$string = substr_replace( $string, '0', $position, 1 ); | |
$string .= '0'; | |
} else { | |
$inc_position = $position - 1; | |
$string = alphanumeric_increment( $string, $inc_position ); | |
$string = substr_replace( $string, '0', $position, 1 ); | |
} | |
break; | |
default: | |
$increment_str++; | |
$string = substr_replace( $string, $increment_str, $position, 1 ); | |
break; | |
} | |
return $string; | |
} |
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