PHP implements sequential linear table-PHP Tutorial-php.cn

PHP implements sequential linear table

What is a linear sequence table?

Linear sequence table refers to storage in memory in order, and is connected one by one except the beginning and end (usually expressed in the form of a one-dimensional array).

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The example code is as follows:

seqArr = $arr; $this->length = count($arr); } /* * 返回线性表中第$index个数据元素 */ public function GetElem($index) { if (($this->length) == 0 || $index < 0 || ($index > $this->length)) { return "Error"; } return $this->seqArr[$index - 1]; } /* * 返回线性表的长度 * */ public function ListLength() { return $this->length; } /* * 返回给定的数据元素在线性表中的位置 */ public function LocateElem($elem) { for ($i = 0; $i < ($this->length); $i++) { if (($this->seqArr[$i]) == $elem) { return $i + 1; } } } /* * PriorElem: 返回指定元素的前一个元素 */ public function PriorElem($elem) { for ($i = 0; $i < ($this->length); $i++) { if (($this->seqArr[$i]) == $elem) { if ($i == 0) { return "Error (is null) "; } else { return $this->seqArr[$i - 1]; } } } } /* * NextElem: 返回指定元素的后一个元素 */ public function NextElem($elem) { for ($i = 0; $i < ($this->length); $i++) { if (($this->seqArr[$i]) == $elem) { return $this->seqArr[$i + 1]; } } } /* * ListInsert: 在第index的位置插入元素elem */ public function ListInsert($index, $elem) { if (($this->length) == 0 || $index < 0 || $index > ($this->length)) { return "Error"; } for ($i = $index; $i < ($this->length); $i++) { $this->seqArr[$i + 1] = $this->seqArr[$i]; } $this->seqArr[$index] = $elem; $this->length = $this->length + 1; return $this->seqArr; } /* * ListDelete: 删除第index位置的元素 */ public function ListDelete($index) { if (($this->length) == 0 || $index < 0 || $index > ($this->length - 1)) { return "Error"; } unset($this->seqArr[$index]); $this->length--; return $this->seqArr; } } ?>

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