photoshop learning network php learning notes function declaration

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/* Function definition:
* 1. A function is a named
* 2. An independent code segment
* 3. A function performs a specific task
* 4. And can return a value to the program that calls it
*
* Advantages of the function:
* 1. Improve the reusability of the program
* 2. Improve the maintainability of the program
* 3. Can improve development efficiency
* 4. Improve the reliability of the software
* 5. Control the complexity of the program
*
* Function declaration
* function function name(){
*
* }
*
* function function name (parameter 1, parameter 2, Parameters...)
* {
* function body
* }
*
* function function name()
* {
* function body;
* return value;
* }
* function function name (parameter list.. .)
* {
* function body;
* return value
* }
*
* Note:
* 1. The function must be called to be executed. It can be called before or after the declaration
* 2. Function The name naming is the same as that of variables, aaa bbb ccc aaaBbbCcc (the first word is lowercase, and the first letter of each subsequent word is capitalized)
* 3. Functions cannot have the same name when declaring
* 4. You can change the behavior of the function by passing parameters to the function
* Formal parameters: When declaring a function, the declared parameters are variables. Multiple parameters are separated by,
* Actual parameters: When calling the function, the formal parameter value (data, which can also be a variable) is passed to
* 5. If If there is no return value, it is called a process
* 6. Return data by using the return statement
* 7. The function execution ends when the return statement is reached. Do not write code after this statement. You can also use return to end the execution of the function
*
* Function The role of the name:
* 1. Call the function and start executing the function
* 2. You can pass data to the function
* 3. The function name is the returned value
*
*
*/
//A function that outputs a table
function table($tablename,$width,$row,$col)
{
echo '

';
echo ' ';
for($i=0;$i<$row;$i++)
{
//Wrap every other line Color
if($i%2==0)
$bg="#cccccc";
else
$bg="yellow";
echo '' ;//Output row
for($j=0;$j<$col;$j++)
{
echo '';
}
echo '

'.($i*$row+$j).'{
echo '';
echo '';
for($i=0;$i<$row;$i++)
{
//Change colors every other row
if( $i%2==0)
$bg="#cccccc";
else
$bg="yellow";
echo '';//Output Row
for($j=0;$j<$col;$j++)
{
echo '';
}
echo '';
}
echo '

'.($i*$row+$j).'

';
}/td>';
}
echo '

';
}
table("Output Table",600,10,10);
table("Output Table 2",300,6,6);
//Another output method
function table2($tablename, $width,$row,$col)
{
$str='';
$str.= '< ;caption>

'.$tablename.'

';
for($i=0;$i<$row;$i++)
{
//Change colors every other row
if($i%2==0)
$bg="#cccccc";
else
$bg="yellow";
$str.='for($j=0;$j<$col;$j++)
{
$str.='';
}
$str.='

'.($i*$row+$j).'< ;/td>';
}
$str.='

';
return $str;
}
echo table2("Direct output Table",400,15,15);
?>

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