Mixed letters and numbers verification code
Make the verification code content display a mixture of letters and numbers
<?php
$image = imagecreatetruecolor(100,30);
$bgcolor = imagecolorallocate($image,255,255,255);//#FFFFFFFFFFFF
imagefill($image,0,0,$bgcolor);
for ($i=0;$i<4;$i++){
$fontsize = 6;
$fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
$data='abcdefghijklmnopqrstuvwxyz1234567890';
$fontcontent=substr($data,rand(0,strlen($data)),1);
$x = ($i * 100/4)+rand(5,10);
$y = rand(5,10);
imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
}
for($i=0;$i<200;$i++){
$pointcolor = imagecolorallocate($image,rand(50,200),rand(50,200),rand(50,200));
imagesetpixel($image,rand(1,99),rand(1,29),$pointcolor);
}
for($i=0;$i<8;$i++){
$linecolor = imagecolorallocate($image,rand(60,220),rand(60,220),rand(60,220));
imageline($image,rand(1,99),rand(1,29),rand(1,99),rand(1,29),$linecolor);
}
header('content-type: image/png');
imagepng($image);
//销毁
imagedestroy($image);
?>Verification code of letters and numbers The difference is not big, you just need to change the generated numbers into letters and numbers.
for ($i=0;$i<4;$i++){
$fontsize = 6;
$fontcolor = imagecolorallocate($image,rand(0,120),rand(0,120),rand(0,120));
$data='abcdefghijklmnopqrstuvwxyz1234567890';
$fontcontent=substr($data,rand(0,strlen($data)),1);
$x = ($i * 100/4)+rand(5,10);
$y = rand(5,10);
imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
}The difference is $data='abcdefghijklmnopqrstuvwxyz1234567890';Define a dictionary
Define the $fontcontent function and intercept the contents in the dictionary The number is displayed immediately.
