贴上代码：
<span>php
</span><span>error_reporting</span>(<span>E_ALL</span> & ~<span>E_NOTICE</span><span>);
</span><span>$expression</span>=<span>$_GET</span>['TrueTable']; <span>//</span><span>读取输入框数据</span>
<span>if</span>(!<span>empty</span>(<span>$_GET</span>['TrueTable'<span>])){
</span><span>$expression</span>=<span>strtoupper</span>(<span>$expression</span>); <span>//</span><span>将输入的小写字母，替代成大写字母</span>
<span>$expressionArr</span>=<span>str_split</span>(<span>$expression</span>); <span>//</span><span>将$expression转换成数组</span>
<span>foreach</span>(<span>$expressionArr</span> <span>as</span> <span>$v</span>){ <span>//</span><span>把字母放在 $varTotal数组中</span>
<span>if</span>(<span>$v</span>>='A' && <span>$v</span>){
<span>$varTotal</span>[]=<span>$v</span><span>;
}
}
</span><span>$varTotal</span> = <span>array_unique</span>(<span>$varTotal</span>); <span>//</span><span>去掉$varTotal数组中重复的字母</span>
<span>sort</span>(<span>$varTotal</span>); <span>//</span><span>$varTotal数组中字母正向排序</span>
<span>$varTotal1</span> = <span>preg_replace</span>("/([A-Z])/","$\\1",<span>$varTotal</span>); <span>//</span><span>$varTotal1数组中字母变成变量</span>
<span>$maxN</span> = <span>count</span>(<span>$varTotal</span><span>);
</span><span>//</span><span>$expressionArr = preg_replace("/([A-Z])/","$\\1",$expressionArr); //$expressionArr数组中字母变成变量</span>
<span>$newExpression</span>=<span>implode</span>('',<span>$expressionArr</span>); <span>//</span><span>$expressionArr数组变成字符串
//echo $newExpression."<br>";</span>
<span>$newExpression</span>= <span>preg_replace</span>("/([A-Z])->([A-Z])/","!\\1|\\2",<span>$newExpression</span><span>);
</span><span>$newExpression</span>= <span>preg_replace</span>("/(\(.*?\))->([A-Z])/","!\\1|\\2",<span>$newExpression</span><span>);
</span><span>$newExpression</span>= <span>preg_replace</span>("/(\(.*?\))->(.*?)/","!\\1|\\2",<span>$newExpression</span><span>);
</span><span>$newExpression</span>= <span>preg_replace</span>("/([A-Z])->(.*?)/","!\\1|\\2",<span>$newExpression</span><span>);
</span><span>$expressionArr</span>=<span>str_split</span>(<span>$newExpression</span>); <span>//</span><span>将$expression转换成数组</span>
<span>$expressionArr</span> = <span>preg_replace</span>("/([A-Z])/","$\\1",<span>$expressionArr</span><span>);
</span><span>$newExpression</span>=<span>implode</span>('',<span>$expressionArr</span><span>);
</span><span>//</span><span>echo $newExpression;</span>
<span>
}
</span>?>
<meta charset="utf-8">
<title>真值表查询1.0 BY:小臻</title>
<span><h1>真值表查询1.0 BY:小臻</h1></span>
<div>
<form action="" method="get">
<input type="text" name="TrueTable" value="<?php echo <span>$_GET</span>['TrueTable'] ?>">
<input type="submit" value="确定"> <br> <br>
<!--<input type="reset" value="取消" /><br /><br />
<input type="button" value="∨" />
<input type="button" value="∧" />
<input type="button" value="┐" />
<input type="button" value="→" />
<input type="button" value="↔" /><br /><br />-->
</form>
<!--[ 说明：析取(∨) , 合取(∧) , 非(┐) , 蕴含(→) , 等价(↔) ]-->
<p>[ 说明：析取(|) , 合取(&) , 非(!) , 蕴含(->) , 等价(=) ]</p>
<table width="300px">
<span>php
</span><span>echo</span> "<tr>"<span>;
</span><span>if</span>(!<span>empty</span>(<span>$_GET</span>['TrueTable'<span>])){
</span><span>foreach</span>(<span>$varTotal</span> <span>as</span> <span>$v</span><span>){
</span><span>echo</span> "<td>{<span>$v</span>}</td>"<span>;
}
</span><span>echo</span> "<td>结果</td>"<span>;
</span><span>$result</span>=<span>pow</span>(2,<span>$maxN</span><span>);
</span><span>for</span>(<span>$i</span>=0;<span>$i</span>$result;<span>$i</span>++<span>){
</span><span>$resultN</span>[<span>$i</span>]=<span>sprintf</span>("%0{<span>$maxN</span>}d",<span>decbin</span>(<span>$i</span><span>));
</span><span>$resultN</span>[<span>$i</span>]=<span>str_split</span>(<span>$resultN</span>[<span>$i</span><span>]);
}
</span><span>foreach</span>(<span>$resultN</span> <span>as</span> <span>$k</span>=><span>$v</span><span>){
</span><span>echo</span> "</tr>
<tr>"<span>;
</span><span>foreach</span>(<span>$resultN</span>[<span>$k</span>] <span>as</span> <span>$k1</span>=><span>$v1</span><span>){
</span><span>echo</span> "<td>".<span>$v1</span>."</td>"<span>;
</span><span>$varTotal2</span>[<span>$k1</span>]=<span>$varTotal1</span>[<span>$k1</span>]."=".<span>$v1</span><span>;
</span><span>//</span><span>echo $varTotal2[$k1]." ";</span>
<span>eval</span>(<span>$varTotal2</span>[<span>$k1</span>].";"<span>);
}
</span><span>//</span><span>echo $newExpression;</span>
<span>eval</span>("\$varTotal3[] = ".<span>$newExpression</span>.";"<span>);
</span><span>foreach</span>(<span>$varTotal3</span> <span>as</span> <span>$k2</span>=><span>$v</span><span>){
</span><span>if</span>(<span>$v</span>==<span>NULL</span><span>){
</span><span>$varTotal3</span>[<span>$k2</span>]=0<span>;
}
}
</span><span>echo</span> "<td>".<span>$varTotal3</span>[<span>$k</span>]."</td>"<span>;
</span><span>echo</span> "</tr>"<span>;
}
</span><span>//</span><span>print_r($varTotal3);</span>
<span> }
</span>?>
</table>
</div>
以上就介绍了php版的求表达式的真值表-TrueValueTable，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
