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Use PHP custom function to implement 99 multiplication table code

伊谢尔伦Original: 2017-06-26 10:38:125019browse

In phpCustom functionCreating a definition is very simple. We only need to use a function space followed by the function name. The intermediate function can have parameters and related content, as follows.

Use a custom function to implement the 99 multiplication table. A function is a block of code that can be executed whenever needed.

Creating PHP functions:
All functions start with the keyword "function()"
Name the function - the name of the function should hint at its function. Function names start with a letter or underscore.
Add “{” – The part after the opening curly brace is the code of the function.
Insert function code
Add a “}” – The function ends by closing the curly brace.
Example
A simple function that prints my name when called:

<html>
<body>
 
<?php
function writeMyName()
  {
  echo "David Yang";
  }
 
writeMyName();
?>
 
</body>
</html>

Using PHP functions
Now, we are going to use this function in a PHP script:

<html>
<body>
 
<?php
function writeMyName()
  {
  echo "David Yang";
  }
echo "Hello world!<br />";
echo "My name is ";
writeMyName();
echo ".<br />That&#39;s right, ";
writeMyName();
echo " is my name.";
?>
 
</body>
</html>

Output of the above code:

Hello world!
My name is David Yang.
That's right, David Yang is my name

Let's write a function to implement the 99 multiplication table

<php?
/**
 * 9*9乘法表
 * string fun_99(int $start=1, int $end =1,bool $sort=true )
 * $start 起始数 必须在1-9之间 并且必须为整数
 * $end 结束值 必须1-9之间 并且必须为整数并且要大于$start
 * $sort 表示排序，true表示正序，FALSE表示倒序
 */
echo "<hr/>";
 
function fun_99($start=1,$end =9,$sort=true){
    if ($start<1||$start>9){
        return &#39;起始数 必须在1-9之间&#39;;
    }
 
    if ($end<1||$end>9){
        return &#39;结束值 必须在1-9之间&#39;;
    }
 
    if($start!=(int)($start)){
        return &#39;起始数 必须为整数&#39;;
    }
 
    if($end!=(int)($end)){
        return &#39;结束值 必须为整数&#39;;
    }
 
    if($start>$end){
        return &#39;起始数必须小于结束值&#39;;
    }
    $str = &#39;&#39;;
    if ($sort){
        for ($i=$start;$i<=$end;$i++)
            {
                $str =$str."<br>";                    
                for ($n=$start;$n<=$end;$n++)
                    {        
                        if ($i >= $n)
                            {                
                                $str=$str."$i*$n".&#39;=&#39;.$i*$n."&nbsp";                            
                            }
                    }
            }
    }else{
        for ($i=$end;$i>=$start;$i--)
            {
                $str =$str."<br>";                    
                for ($n=$end;$n>=$start;$n--)
                    {        
                        if ($i >= $n)
                            {                
                                $str=$str."$i*$n".&#39;=&#39;.$i*$n."&nbsp";                    
                            }
                    }
            }
}
return $str;
}
echo fun_99(1,9,true);
?>

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