Backend DevelopmentPHP TutorialUse PHP custom function to implement 99 multiplication table codeUse PHP custom function to implement 99 multiplication table code
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'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 '起始数 必须在1-9之间';
}
if ($end<1||$end>9){
return '结束值 必须在1-9之间';
}
if($start!=(int)($start)){
return '起始数 必须为整数';
}
if($end!=(int)($end)){
return '结束值 必须为整数';
}
if($start>$end){
return '起始数必须小于结束值';
}
$str = '';
if ($sort){
for ($i=$start;$i<=$end;$i++)
{
$str =$str."<br>";
for ($n=$start;$n<=$end;$n++)
{
if ($i >= $n)
{
$str=$str."$i*$n".'='.$i*$n." ";
}
}
}
}else{
for ($i=$end;$i>=$start;$i--)
{
$str =$str."<br>";
for ($n=$end;$n>=$start;$n--)
{
if ($i >= $n)
{
$str=$str."$i*$n".'='.$i*$n." ";
}
}
}
}
return $str;
}
echo fun_99(1,9,true);
?>The above is the detailed content of Use PHP custom function to implement 99 multiplication table code. For more information, please follow other related articles on the PHP Chinese website!
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