Let us further understand the if statement of PHP flow control statement! ! ! (Source code attached)

The previous article introduced you to " Regarding the if conditional structure process of PHP process control, "Xiaobai" will continue to lead you to discuss ". This article continues to introduce to you the if statement of PHP process control statement. : Detailed explanation with pictures and text! ! !

Through the if statement we learned before, we use PHP to write a calculator to further describe the usage of the if statement:

The code is as follows:

<form action=&#39;&#39; method=&#39;get&#39;>
     <input type="text" name="num1">
     <select name="fh">
        <option value="jia">+</option>
        <option value="jian">-</option>
        <option value="c">*</option>
        <option value="chu">/</option>
        <option value="qy">%</option>
      </select>
      <input type="text" name="num2">
      <input type="submit" value="运算"/> 
</form>

<?php
     $num1 = $_GET[&#39;num1&#39;];
     $num2 = $_GET[&#39;num2&#39;];
     $fh =$_GET[&#39;fh&#39;];

     if(!is_numeric($num1) || !is_numeric
          ($num2)){
              echo &#39;请输入数值类型&#39;;
          }
          if($fh==&#39;jia&#39;){
              echo $num1 . &#39;+&#39; . $num2 . &#39;=&#39; .
              ($num1+$num2);
          }
          if($fh==&#39;jian&#39;){
            echo $num1 . &#39;-&#39; . $num2 . &#39;=&#39; .
            ($num1-$num2);
        }
        if($fh==&#39;c&#39;){
            echo $num1 . &#39;*&#39; . $num2 . &#39;=&#39; .
            ($num1*$num2);
        }
        if($fh==&#39;chu&#39;){
            echo $num1 . &#39;/&#39; . $num2 . &#39;=&#39; .
            ($num1/$num2);
        }
        if($fh==&#39;qy&#39;){
            echo $num1 . &#39;%&#39; . $num2 . &#39;=&#39; .
            ($num1%$num2);
        }




?>

The running results are as follows:

Recommended learning: "PHP Video Tutorial"

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