The format of function definition in php

The format of function definition in php

Function is a function. Encapsulate a piece of code that performs a specific function. Calling a function is calling a function.

Custom function

function generate_table($row, $col){
$html = &#39;<table>&#39;;
for ($i = 1; $i <= $row; ++$i) {
      $html .= &#39;<tr>&#39;;
           for ($j = 1; $j <= $col; ++$j){
               $html .= &#39;<td></td>&#39;;
        }
         $html .= &#39;</tr>&#39;;
}
   return $html.&#39;</table>&#39;;
}
echo generate_table(5,5);

The above is to use a custom function to define the table generator as a function.

Basic syntax format of function

function 函数名([参数1, 参数2, ……]){
    函数体……
}

function: Keywords that must be used when declaring a function

Function name: Identifier that must comply with PHP , and the function name is unique and case-insensitive

[Parameter 1, Parameter 2...]: The value passed to the function from the outside world, it is optional, use commas "," between multiple parameters Separate.

Function body: The main body of the function definition, a code segment specifically used to implement specific functions.

Return value: You need to use the return keyword to pass the data that needs to be returned to the caller.

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