Several functional codes you need to master when getting started with PHP

Classic loop example

Classic loop example

for($counter = 1; $counter <= 6; $counter++) //Loop 6 times
{
print("counter is $counter
n"); }
?>

Advanced use of for

Advanced uses for

/*
** Print necessary description text
*/
Print("How many days until Monday?n");
Print("

" . date("l", $currentDate) . "n");
}
Print("

n");
?>

Simple call of function:

Simple function

Function printBold($inputText) //Define function printBold()
{
                                                                                                                       Print }
Print("This line is not emphasized!
n"); //Print the string directly
printBold("This line is aggravated!!!"); //Call function printBold() function
Print("
n");
Print("This line is not emphasized!
n"); //Print the string directly
?>

Function with return value

Function with return value

Function makeBold($inputText) //Define function makeBold() function
{
         $boldedText = "";
         $boldedText .= $inputText;
         $boldedText .= "";
         return($boldedText);                                                                                                                                              .}
Print("This line is not emphasized!!!
n"); //Print the string directly
Print(makeBold("This line is emphasized!!!") . "
n");//Call function makeBold() function
Print("This line is not emphasized!!!
n"); //Print the string directly
?>

Function with default parameters

Function with default parameters

Function printColored($Text, $Color="black") //Define function function
{
                                                                                                                                                                                                                       Get the content and color of the string
}
printColored("This is a black word!"); //Call function
Print("

n");
printColored("This is a blue word!", "blue"); //Call function
Print("
n");
?>

Use recursive algorithm to determine whether it is an integer

Judge integers

Function checkInteger($Number)
{
If($Number > 1)
                                      {
                    /* An integer minus 1 is still an integer */
                return(checkInteger($Number-1));
          }
        elseif($Number < 0)
                                      {
                     /* For a negative number, */
to /* can be analyzed for its absolute value*/
              return(checkInteger((-1)*$Number-1));//Take the absolute value and analyze negative numbers as integers
          }
        else
                                      {
If(($Number > 0) AND ($Number < 1))
                                                                   Return("Of course not");
                                                                               else
                                                                   /*0 and 1 are integer*/
/*According to the relevant mathematical definition*/
Return("Yes");
                                                                          }
}
Print("Is 0 an integer?" .
checkInteger (0) . "
n"); Print("Is 7 an integer? " .
           checkInteger(7) . "
n");
print("What about 3.5?" . checkInteger(3.5) . "
n");
print("What about -5?" . checkInteger(-5) . "
n");
print("And -9.2?" . checkInteger(-9.2) . "
n");
?>

Initialize array

Initializing array

$monthName = array(1=>"January", "February", "March",//Initialize an array
"April", "May", "June", "July", "August",
"September", "October", "November", "December");
Print(""May" in English is $monthName[5] .
n");//Print the 6th element in the array
?>

Get the elements in the array

Get elements in the array

$monthName = array(
/*Define $monthName[1] to $monthName[12]*/
1=>"January", "February", "March",
"April", "May", "June",
"July", "August", "September",
"October", "November", "December",
/*Define $monthName["Jan"] to $monthName["Dec"]*/
"Jan"=>"January", "Feb"=>"February",
"Mar"=>"March", "Apr"=>"April",
"May"=>"May", "Jun"=>"June",
"Jul"=>"July", "Aug"=>"August",
"Sep"=>"September", "Oct"=>"October",
"Nov"=>"November", "Dec"=>"December",
/*Define $monthName["Jan"] to $monthName["Dec"]*/
"January"=>"January", "February"=>"February",
"March"=>"March", "April"=>"April",
"May"=>"May", "June"=>"June",
"July"=>"July", "August"=>"August",
"September"=>"September", "October"=>"October",
"November"=>"November", "December"=>"December"
);
/*Print related elements*/
print("Month 5 is " . $monthName[5]. "
n");
print("Month Aug is " . $monthName["Aug"] . "
n");
print("Month June is " . $monthName["June"] . "
n");
?>

Create a multidimensional array

Create a multidimensional array

$Cities = array( "North China"=>array(
"Beijing City",
"Tianjin City",
"Shijiazhuang"
),
"Northwest Region"=>array(
"Xi'an",
"Lhasa"
)
);
print("North China: ".$Cities["North China"][0]); //Print $Cities["North China"][0]
?>

PHP 4.0 realizes table-like printing

Realize table-like printing

/*
** Data tabulation
*/
Print("

n"); // Table starts
for($Row=1; $Row <= 12; $Row ++)
{
print("n"); //Start line

             // do each column
for($Column=1; $Column <= 12; $Column ++)
                                      {
print("");
        }
           print("n"); // End of line
}
Print("

");//Start column
print($Row *$Column);//Product of table elements
Print("

n"); // End of table
?>

View some variables of the system

View PHP environment variables

Print("The name of the file you are using is: ");
Print(__FILE__);
Print("
n");
Print("

");
Print("Your operating system is: ");
Print(PHP_OS);
Print("

");
Print("Your php version is: ");
Print(PHP_VERSION)
?>

Open local or remote file

Open local or remote file

Print("

Open file via http protocol

n");
// Open the file via http protocol
If(!($myFile = fopen("d:web/web/php/test/data.txt", "r")))
{
print("File cannot be opened");
exit;
}
While(!feof($myFile)) //Loop
{
         $myLine = fgetss($myFile, 255);
print("$myLine
n");
}
//Close the file handle
fclose($myFile);
?>

Comparison of several ways to open files

Read file content

//Open the file and print every character of the file
If($myFile = fopen("data.txt", "r"))
{
While(!feof($myFile))
{
         $myCharacter = fgetc($myFile);
          print($myCharacter);
}
fclose($myFile);
}
?>
");?>
//Open the file and print each line of the file
If($myFile = fopen("data.txt", "r"))
{
while(!feof($myFile))
                                                                                 $myLine = fgets($myFile, 255);
Print($myLine);
           }
fclose($myFile);
}
?>
");?>
/* Open the file and print each line of the file,
At the same time, remove the HTML language in the retrieved string
*/
If($myFile = fopen("data.txt", "r"))
{
while(!feof($myFile))
                                                                                  $myLine = fgetss($myFile, 255);
Print($myLine);
           }
           fclose($myFile);
}
?>

Access common file properties

Access common file properties

Print("Owner of file (UID value):");
Print(fileowner("data.txt")."
");
Print("File size:");
Print(filesize("data.txt")."
");
Print("File type:");
Print(filetype("data.txt")."
");
?>

Calling text file content

Calling text file content

// Open the file and print each line
$myFile = file( "data.txt");
for($index = 0; $index < count($myFile); $index++)
{
print($myFile[$index]."
");
}
?>

Create directory function

Create directory function

If(mkdir("myDir1", 0777)) //Function to create a directory
{
Print ("Successful directory creation"); // The directory establishes successful
}
else
{
Print ("Directory establishment failed!"); // The establishment of the directory failed
}
?>

Browse catalog

Browse Catalog

//Use the table to browse the structure of the directory
Print("n");
//Create the header of the table
Print("n");
Print("n");
Print("n");
Print("n");
$myDirectory = opendir("."); // Create a handle to the operating directory
// Read each sub-item in the directory
While($entryName = readdir($myDirectory))
{
print("");
print("");
Print("");
print("n");
}
Print("

File name	File size
$entryName	"); print(filesize($entryName)); Print("

n");
?>

PHP related information

PHP related information

phpinfo();
?>

Commonly used numerical judgment functions

Commonly used numerical judgment functions

//Judgment array
$colors = array("red", "blue", "green");
If(is_array($colors))
{
print("colors is an array"."
");
}
//Double precision number judgment
$Temperature = 15.23;
If(is_double($Temperature))
{
print("Temperature is a double"."
");
}
//Integer judgment
$PageCount = 2234;
If(is_integer($PageCount))
{
print("$PageCount is an integer"."
");
}
//Object judgment
class widget
{
var $name;
var $length;
}
$thing = new widget;
If(is_object($thing))
{
print("thing is an object"."
");
}
//Character judgment
$Greeting = "Hello";
If(is_string($Greeting))
{
print("Greeting is a string"."
");
}
?>

File upload interface

File upload interface

if($UploadAction){
$UploadAction=0;
$TimeLimit=60; /*Set the timeout limit time. The default time is 30s. When set to 0, it is unlimited */
set_time_limit($TimeLimit);
If(($Upfile != "none")&&
($Upfile != ""))
{
$Filepath="d:webwebphptest"; //Upload file storage path
$FileName=$Filepath.$Upfile_name;
if($Upfile_size <1024) {$FileSize = (string)$Upfile_size . "Bytes";}
elseif($Upfile_size <(1024 * 1024))
{
$FileSize = number_format((double)($Upfile_size / 1024), 1) . " KB";
}
else
{
$FileSize = number_format((double)($Upfile_size/(1024*1024)),1)."MB";
}
if(!file_exists($FileName))
{
if(copy($Upfile,$FileName))
{unlink($Upfile);
echo "

n"; echo "File $Upfile_name has been uploaded successfully!";
echo "

n";
echo "File location: $FileName";
echo "

n";
echo "File size: $FileSize";
echo "

n";
}
else
{echo "File $Upfile_name upload failed!"; }
}
else
{echo "File $Upfile_name already exists!"; }
}
else
{echo "You did not select any files to upload!"; }
set_time_limit(30); }
?>
ACTION = "default.php" METHOD = "POST">

Several functional codes you need to master when getting started with PHP_PHP Tutorial

Open file via http protocol