我使用了上面的答案并在函数中进行了一些更改以获得以下内容。这对我有用。
<?php
ini_set ( 'display_errors', E_ALL );
require_once ('jSignature_Tools_Base30.php');
function base30_to_jpeg($base30_string, $output_file) {
$data = str_replace ( 'image/jsignature;base30,', '', $base30_string );
$converter = new jSignature_Tools_Base30 ();
$raw = $converter->Base64ToNative ( $data );
// Calculate dimensions
$width = 0;
$height = 0;
foreach ( $raw as $line ) {
if (max ( $line ['x'] ) > $width)
$width = max ( $line ['x'] );
if (max ( $line ['y'] ) > $height)
$height = max ( $line ['y'] );
}
// Create an image
$im = imagecreatetruecolor ( $width + 20, $height + 20 );
// Save transparency for PNG
imagesavealpha ( $im, true );
// Fill background with transparency
$trans_colour = imagecolorallocatealpha ( $im, 255, 255, 255, 127 );
imagefill ( $im, 0, 0, $trans_colour );
// Set pen thickness
imagesetthickness ( $im, 2 );
// Set pen color to black
$black = imagecolorallocate ( $im, 0, 0, 0 );
// Loop through array pairs from each signature word
for($i = 0; $i < count ( $raw ); $i ++) {
// Loop through each pair in a word
for($j = 0; $j < count ( $raw [$i] ['x'] ); $j ++) {
// Make sure we are not on the last coordinate in the array
if (! isset ( $raw [$i] ['x'] [$j] ))
break;
if (! isset ( $raw [$i] ['x'] [$j + 1] ))
// Draw the dot for the coordinate
imagesetpixel ( $im, $raw [$i] ['x'] [$j], $raw [$i] ['y'] [$j], $black );
else
// Draw the line for the coordinate pair
imageline ( $im, $raw [$i] ['x'] [$j], $raw [$i] ['y'] [$j], $raw [$i] ['x'] [$j + 1], $raw [$i] ['y'] [$j + 1], $black );
}
}
// Check if the image exists
if (! file_exists ( dirname ( $output_file ) )) {
mkdir(dirname($output_file));
}
// Create Image
$ifp = fopen ( $output_file, "wb" );
imagepng ( $im, $output_file );
fclose ( $ifp );
imagedestroy ( $im );
return $output_file;
}
// test
$imgStr ='image/jsignature;base30,7U010100010000000001_1G88b8ace99aab756856_bE2000000010000000101_1D6689cbaa9b956558564_8w757698987766566556545_3PZ2110101010100000000Y10_fF0000Z2100001000Y110_1V9789cb86966655475_fK_1x';
base30_to_jpeg ( $imgStr, 'test.png' );
?>