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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); ?>
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