PHP introductory learning knowledge point 7 Basic application of PHP functions_PHP tutorial

Copy code The code is as follows:

/*
* Simple function
*/
function fontBold($con){
return "$con";
}
$str="Simple function test!";
echo " Normal text: $str
";
echo "Bold text:".fontBold($str)."";
/*
* Function with optional parameters
*/
function fontColor($con,$color="bule"){
return "$con";
}
$str ="Color test";
echo $str;
echo fontColor($str."This is without color parameters (default is blue)!");
echo fontColor($str," red"."This is with color parameters (default is red!)");
/*
* Recursive function
*/
function chckint($Num){
if( $Num>1){
return chckint($Num-1);
}else if($Num<0){
return chckint(($Num*-1)-1);
}else{
if($Num>0 && $Num<1){
return false;
}else if($Num){
return true;
}
}
}
$Num=3;
if(chckint($Num)){
echo $Num."It’s an integer!";
}else{
echo $Num ."Not an integer";
}
/*
*Dynamic call function
*/
function write($con){
echo "$con";
}
function writeBold($con){
echo "$con";
}
$myFupnction="write";
$myFupnction("This is An example of dynamically calling a function without bolding it! ");
$myFupnction="writeBold";
$myFupnction("This is an example of dynamically calling bold!")
?>

http://www.bkjia.com/PHPjc/323821.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/323821.htmlTechArticleCopy the code as follows: ?php /* * Simple function*/ function fontBold($con){ return " B$con/B"; } $str="Simple function test! "; echo "Normal text: $strbr"; echo "Bold text...