65 lines
1.2 KiB
PHP
65 lines
1.2 KiB
PHP
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<?php
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/**
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* Class to increase an ID
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*/
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class IdIncreaser {
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private $chars = "0123456789abcdefghijklmnopqrstuvwxyz";
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private $c = NULL;
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function __construct($current, $alphabet = "") {
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if (strlen($alphabet) > 0) {
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$this->chars = $alphabet;
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}
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$this->c = new OneChar($current, $this->chars);
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}
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function increase() {
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$this->c->increase();
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}
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function build() {
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return $this->c->build();
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}
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}
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class OneChar {
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private $chars;
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private $otherChar = NULL;
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private $pos = 0;
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function __construct($s, $ch) {
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$this->chars = $ch;
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$current = substr($s, -1, 1);
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$this->pos = strpos($this->chars, $current);
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$s = substr($s, 0, strlen($s)-1);
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if (strlen($s) > 0) {
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$this->otherChar = new OneChar($s, $ch);
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}
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}
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function increase() {
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$this->pos = $this->pos + 1;
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if ($this->pos >= strlen($this->chars)) {
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$this->pos = 0;
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if ($this->otherChar != NULL) {
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$this->otherChar->increase();
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} else {
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$this->otherChar = new OneChar($this->chars[0], $this->chars);
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}
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}
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}
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function build() {
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if ($this->otherChar != NULL) {
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return $this->otherChar->build() . $this->chars[$this->pos];
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}
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return $this->chars[$this->pos];
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}
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}
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