$width = 400;

$height = 100;

$im = ImageCreate($width, $height);

$bg = ImageColorAllocate($im, 255, 255, 255);

$border = ImageColorAllocate($im, 255, 0, 0);

ImageRectangle($im, 0, 0, $width - 1, $height - 1, $border);

$text = 'This is the text which is center of image.';

$textcolor = ImageColorAllocate($im, 255, 0, 0);

$font = 3;

$font_width = ImageFontWidth($font);

$font_height = ImageFontHeight($font);

$text_width = $font_width * strlen($text);

$position_center = ceil(($width - $text_width) / 2);

$text_height = $font_height;

$position_middle = ceil(($height - $text_height) / 2);

$image_string = ImageString($im, $font, $position_center, $position_middle, $text, $textcolor);

header("Content-type: image/jpeg");

Imagejpeg($im);

After running the program you will get the following output

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