30 lines
829 B
PHP
30 lines
829 B
PHP
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<?php
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/*
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File: set.so.php
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License: GPL
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Purpose: We should really have a "set" data type. It's too useful.
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*/
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class set {
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function __construct($list=array()) { $this->data = array_count_values($list); }
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function has($item) { return isset($this->data[$item]); }
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function add($item) { $this->data[$item] = true; }
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function del($item) { unset($this->data[$item]); return $item;}
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function all() { return array_keys($this->data); }
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function one() { return key($this->data); }
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function count() { return count($this->data); }
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function pop() { return $this->del($this->one()); }
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function union($that) {
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$progress = false;
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foreach ($that->all() as $item) if (!$this->has($item)) {
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$this->add($item);
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$progress = true;
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}
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return $progress;
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}
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function text() {
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return ' { '.implode(' ', $this->all()).' } ';
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}
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}
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