PHP 5.4.33 Released

imagechar

(PHP 4, PHP 5)

imagecharDraw a character horizontally

Descrizione

bool imagechar ( resource $image , int $font , int $x , int $y , string $c , int $color )

imagechar() draws the first character of c in the image identified by image with its upper-left at x,y (top left is 0, 0) with the color color.

Elenco dei parametri

image

Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().

font

Può essere 1, 2, 3, 4, 5 per i font interni con codifica latin2 (dove numeri più alti corrispondono a font più grandi) o qualsiasi identificatore di font registrato con imageloadfont().

x

x-coordinate of the start.

y

y-coordinate of the start.

c

The character to draw.

color

A color identifier created with imagecolorallocate().

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.

Esempi

Example #1 imagechar() example

<?php

$im 
imagecreate(100100);

$string 'PHP';

$bg imagecolorallocate($im255255255);
$black imagecolorallocate($im000);

// prints a black "P" in the top left corner
imagechar($im100$string$black);

header('Content-type: image/png');
imagepng($im);

?>

Il precedente esempio visualizzerà qualcosa simile a:

Output of example : imagechar()

Vedere anche:

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User Contributed Notes 2 notes

up
2
liam dot wiltshire at lineone dot net
5 years ago
A quick function to automatically generate a multi line image from a string, with the image size automatically calculated from the string itself.

<?php

function multilineimage($string){

   
// Probably not the best way of handling newlines, but bar OS9, doesn't really cause a problem
   
$string = str_replace("\r","",$string);
   
$string = explode("\n",$string);

   
$maxlen = 0;
    foreach (
$string as $str){
        if (
strlen($str) > $maxlen){
           
$maxlen = strlen($str);
        }
    }

   
// Set font size
   
$font_size = 4;

   
// Create image width dependant on width of the string
   
$width  = imagefontwidth($font_size)*$maxlen;
   
// Set height to that of the font
   
$height = imagefontheight($font_size) * count($string);
   
// Create the image pallette
   
$img = imagecreate($width,$height);
   
// Grey background
   
$bg    = imagecolorallocate($img, 205, 255, 255);
   
// White font color
   
$color = imagecolorallocate($img, 0, 0, 0);

   
$ypos = 0;

    foreach (
$string as $str){

       
$len = strlen($str);
        for(
$i=0;$i<$len;$i++){
           
// Position of the character horizontally
           
$xpos = $i * imagefontwidth($font_size);
           
// Draw character
           
imagechar($img, $font_size, $xpos, $ypos, $str, $color);
           
// Remove character from string
           
$str = substr($str, 1);  
        }
       
$ypos = $ypos + imagefontheight($font_size);  
    }

   
// Return the image
   
header("Content-Type: image/gif");
   
imagegif($img);
   
// Remove image
   
imagedestroy($img);
}

multilineimage("This is an image
This is line 2\nLine 3
Line 4"
);

?>
up
0
sw at profilschmiede dot de
9 years ago
For the sake of completeness, here is an example for imagechar.
The base-image automatically adjusts to the size and the height of the given string. Using the rand()-function the y-position of each char is slightly varied with every loop-run. You can easily rewrite the script to use a randomly generated string - the one given here just serves as an example.

<?php

$string
= '1 2 3 4 5 6 7 8 9 A B C D E F G';
$font_size = 5;
$width=imagefontwidth($font_size)*strlen($string);
$height=imagefontheight($font_size)*2;
$img = imagecreate($width,$height);
$bg = imagecolorallocate($img,225,225,225);
$black = imagecolorallocate($img,0,0,0);
$len=strlen($string);

for(
$i=0;$i<$len;$i++)
{
   
$xpos=$i*imagefontwidth($font_size);
   
$ypos=rand(0,imagefontheight($font_size));
   
imagechar($img,$font_size,$xpos,$ypos,$string,$black);
   
$string = substr($string,1);   
   
}
header("Content-Type: image/gif");
imagegif($img);
imagedestroy($img);
?>
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