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<?php//运算符$x = 88;$y = 66;//加echo $x + $y;echo '<hr>';//减echo $x - $y;echo '<hr>';//乘echo $x * $y;echo '<hr>';//除echo $x / $y;echo '<hr>';//取余echo $x % $y;echo '<hr>';//连接echo $x.'+'.$y.'='.$x+$y;echo '<hr>';//自增$a = 99;$b = 99;echo $a++;echo '<br>';echo $a;echo '<br>';echo ++$b;echo '<br>';echo $b;echo '<hr>';//自减$c = 99;$d = 99;echo $c--;echo '<br>';echo $c;echo '<br>';echo --$d;echo '<br>';echo $d;echo '<hr>';?>
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<?php//赋值运算符//赋值，左边等于右边，x=y$a = 100;echo $a;echo '<hr>';//加等，x+=y>>>x=x+y$b = 1;echo $b += 99;echo '<hr>';//减等，x-=y>>>x=x-y$c = 199;echo $c -= 99;echo '<hr>';//乘等，x*=y>>>x=x*y$d = 10;echo $d *= 10;echo '<hr>';//除等，x/=y>>>x=x/y$e = 1000;echo $e /= 10;echo '<hr>';//取余等于，x%=y>>>x=x%y$f = 100;echo $f %= 4;echo '<hr>';//连接$g="Hello";$g .= " world!";echo $g;?>
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<?php//字符串函数$nickName = 'shiro';//strtoupper()将字符串小写字母转为大写echo strtoupper($nickName);echo '<hr>';//strlen()获取字符串长度echo strlen($nickName);echo '<hr>';//strtolower()将字符串大写字母转化为小写$nickName = 'NEKO';echo strtolower($nickName);echo '<hr>';//trim()去掉字符串两边的空白echo ' study ';echo '<br>';echo trim(' study ');echo '<hr>';//strrev()反转字符串,只能反转英文echo strrev("Hello world!");echo '<hr>';//strpos()函数用于检索字符串内指定的字符或文本echo strpos("Hello world!",'w');echo '<hr>';//ucfirs()首字母大写echo ucfirst("program files");echo '<hr>';//ucwords()把字符串中每个单词的首字符转换为大写echo ucwords("program files");echo '<hr>';//str_repeat()把字符串重复指定的次数echo str_repeat("php",3);echo '<hr>';//str_replace() 替换字符串中的一些字符为指定字符(区分大小写)echo str_replace("World","php中文网","Hello World!");echo '<hr>';?>
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<?php$purchase = [['name' => '笔记本','price' => 5 ,'number' => 200 ,],['name' => '钢笔','price' => 5 ,'number' => 200 ,],['name' => '显示器','price' => 500 ,'number' => 20 ,],['name' => '电脑主机','price' => 6000 ,'number' => 20 ,],['name' => '键鼠套装','price' => 55 ,'number' => 20 ,],['name' => '桌子','price' => 550 ,'number' => 25 ,]];$thead = ['序号','名称','数量','单价','金额'];function table($purchase,$thead){$table = '<table>';$table .='<thead>'.'<tr>';foreach ($thead as $thead_k => $thead_v) {$table .= '<th>'.$thead_v.'</th>';}$table .= '</tr>'.'</thead>';$table .= '<tbody>';foreach ($purchase as $item_k => $items) {$table .= '<tr>';$table .= '<td>'.($item_k + 1).'</td>';// $table .= '<td>'.$items['name'].'</td>';// $table .= '<td>'.$items['price'].'</td>';// $table .= '<td>'.$items['number'].'</td>';// $table .= '<td>'.($items['price'] * $items['number']).'</td>';foreach ($items as $item) {$table .= '<td>'.$item.'</td>';}$table .= '<td>'.($items['price'] * $items['number']).'</td>';$table .= '<tr>';}$table .= '</tbody>';$table .= '</table>';return $table;}?><!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>采购单</title><style>table{border: 1px solid black;border-collapse: collapse;}td,th {width: 120px;border: 1px solid black;text-align: center;}</style></head><body><?php echo table($purchase ,$thead); ?></body></html>
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