Functions of the PHP GD library (i)

PHP GD Library related tutorials：
1.PHP Development watermark and thumbnail tutorial
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Image_type_to_mime_type-Gets the MIME type of the image type returned by Getimagesize,exif_read_data,exif_thumbnail,exif_imagetype//$aa = GetImageSize ("./logo_i.gif");//print_r (Image_type_to_mime_type ($AA));//imagearc — Draw elliptical Arcs/*bool Imagearc (resource $image, int $cx, int $cy, int $w, int $h, int $s, int $e, int $color),//$image: Resources//$CX: Left off The position of the Center//$cy: The position of the top from the Center//$w: Round diameter around//$h: Round diameter//$s: 0 degrees clockwise Draw//$e://$color: Round color//Create a 200X200 image $img = Imagecreatetruecolor (200, 200);//Assign Color $white = imagecolorallocate ($img, 255, 255, 255); $black = Imagecolorallocate ($img , 0, 0, 0);//Draw a white round imagearc ($img, +, +,, content-type:image/png, 0, N, $white);//Output the image to the browser header (""); imag Epng ($img);//Release Memory Imagedestroy ($IMG); *///imagechar — Draw a character horizontally/*bool Imagechar (resource $image, int $font, int $x, int $y, string $c, int $color) $image: Resource $font: Font size $x: text Distance from left border $y: The distance from the top of the text $c: the first character of the string C is drawn in the image specified by $color: The color of the text $im = Imagecreate (100,100); $string = ' php '; $bg = Imagecolorallocate ($im, 255, 255, 255); $black = imagecolorallocate ($im, 0, 0, 0);//Prints a black "P" in the top left Cornerimagechar ($im, 1, 0, 0, $str ING, $black); header (' content-type:image/png '); Imagepng ($im); *///imagecharup — To draw a character vertically/*bool Imagecharup (resource $image, int $font, int $x, int $y, string $c, int $color) $image: Resource $font: Font size $x : The distance from the left border of the text $y: The distance from the top of the text $c: the first character of the string C is drawn in the image specified by $color: The color of the text $im = Imagecreate (100,100); $string = ' Note that the Firs T letter is a N '; $bg = Imagecolorallocate ($im, 255, 255, 255); $black = imagecolorallocate ($im, 0, 0, 0);//Prints a black "Z" on a white Backgroundimagecharup ($im, 3, ten, $string, $black); header (' content-type:image/png '); Imagepng ($IM); * * Imagecolorallocate — Assigns a color to an image/*int Imagecolorallocate (resource $image, int $red, int $green, int $blue) $image: Picture Resource $red, $green, $blue are required To the color of the red, green, blue ingredients. These parameters are integers from 0 to 255 or hexadecimal 0x00 to 0xFF the first call to Imagecolorallocate () fills the color palette-based image with the background color $im = imagecreate (100, 100);//Background set to red $bac Kground = ImagEcolorallocate ($im, 255, 0, 0);//Set some colors $white = imagecolorallocate ($im, 255, 255, 255); $black = imagecolorallocate ($im, 0 , 0, 0);//16 Binary $white = Imagecolorallocate ($im, 0xFF, 0xFF, 0xFF); $black = Imagecolorallocate ($im, 0x00, 0x00, 0x00); hea Der (' Content-type:image/png '); Imagepng ($im); *///imagecolorallocatealpha — Assigns a color to an image + Alpha/*int Imagecolorallocatealpha (resource $image, int $red, int $green, int $blue, int $alpha) Imageco The behavior of Lorallocatealpha () is the same as imagecolorallocate (), but with an extra transparency parameter of alpha, its value is from 0 to 127. 0 means completely opaque and 127 is completely transparent. $size = +; $image =imagecreatetruecolor ($size, $size);//Use a white background with a black border to draw a square $back = imagecolorallocate ($image, 255, 255, 255 ); $border = imagecolorallocate ($image, 0, 0, 0); Imagefilledrectangle ($image, 0, 0, $size-1, $size-1, $back); imagerecta   Ngle ($image, 0, 0, $size-1, $size-1, $border); $yellow _x =; $yellow _y = _y; $red _x = 165; $red _x = 187; $blue _y = $radius = 150;//assigns some color with alpha value $yellow = imagecolorallocateAlpha ($image, 255, 255, 0), $red = Imagecolorallocatealpha ($image, 255, 0, 0, imagecolorallocatealpha); $blue $image, 0, 0, 255, 75);//Draw three overlapping round imagefilledellipse ($image, $yellow _x, $yellow _y, $radius, $radius, $yellow); Imagefilledellipse ($image, $red _x, $red _y, $radius, $radius, $red); Imagefilledellipse ($image, $blue _x, $blue _y, $ Radius, $radius, $blue);//Don't forget to output the correct header! Header (' content-type:image/png ');//FINAL Output imagepng ($image); Imagedestroy ($image); *///imagecolordeallocate & Mdash Cancels the assignment of the image Color/*bool imagecolordeallocate (resource $image, int $color) imagecolordeallocate () function canceled previously by Imagecolorallocate () or Imagecolorallocatealpha () to assign a color. $im = imagecreate (100, 100);//Background set to red $background = Imagecolorallocate ($im, 255, 0, 0);//Set some color $white = Imagecolorallocat E ($im, 255, 255, 255) imagecolordeallocate ($im, $white); header (' content-type:image/png '); Imagepng ($im); */// Imagecolorexact — Gets the index value of the specified color/*int imagecolorexact (resource $image, int $red, int $green, int $Blue) returns the index value of the specified color in the image palette. Returns 1 if the color is not in the image's palette. If you create an image from a file, only the colors used in the image will be discriminated. Colors that appear only in the palette are not discriminated. $im = imagecreate (100, 100);//Background set to red $background = Imagecolorallocate ($im, 255, 0, 0);//Set some color $white = Imagecolorallocat E ($im, 255, 255, 255); $aa = Imagecolorexact ($im, 255, 0, 0); echo $aa;//Not present return -1*///imagecolorset — Sets the color for the specified palette index/*void imagecolorset (resource $image, int $index, int $red, int $green, int $blue) This function sets the index specified in the palette to the specified color 。 $im = Imagecreate (+), $background = Imagecolorallocate ($im, 255, 0, 0); for ($c = 0; $c

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