用PHP实现登陆验证码(类似条行码状)

发布时间：2020-12-13 14:12:31 所属栏目：PHP教程来源：网络整理

导读：?php ?? ??function UPCAbarcode($code) { ?? $lw = 2; $hi = 100; ?? $Lencode = array('0001101','0011001','0010011','0111101','0100011', ?? '0110001','0101111','0111011','0110111','0001011'); ?? $Rencode = array('1110010','1100110','1101100',

<?php
??
??function UPCAbarcode($code) {
?? $lw = 2; $hi = 100;
?? $Lencode = array('0001101','0011001','0010011','0111101','0100011',
?? '0110001','0101111','0111011','0110111','0001011');
?? $Rencode = array('1110010','1100110','1101100','1000010','1011100',
?? '1001110','1010000','1000100','1001000','1110100');
?? $ends = '101'; $center = '01010';
?? /* UPC-A Must be 11 digits,we compute the checksum. */
?? if ( strlen($code) != 11 ) { die("UPC-A Must be 11 digits."); }
?? /* Compute the EAN-13 Checksum digit */
?? $ncode = '0'.$code;
?? $even = 0; $odd = 0;
?? for ($x=0;$x<12;$x++) {
?? if ($x % 2) { $odd += $ncode[$x]; } else { $even += $ncode[$x]; }
?? }
?? $code.=(10 - (($odd * 3 + $even) % 10)) % 10;
?? /* Create the bar encoding using a binary string */
?? $bars=$ends;
?? $bars.=$Lencode[$code[0]];
?? for($x=1;$x<6;$x++) {
?? $bars.=$Lencode[$code[$x]];
?? }
?? $bars.=$center;
?? for($x=6;$x<12;$x++) {
?? $bars.=$Rencode[$code[$x]];
?? }
?? $bars.=$ends;
?? /* Generate the Barcode Image */
?? $img = ImageCreate($lw*95+30,$hi+30);
?? $fg = ImageColorAllocate($img,0);
?? $bg = ImageColorAllocate($img,255,255);
?? ImageFilledRectangle($img,$lw*95+30,$hi+30,$bg);
?? $shift=10;
?? for ($x=0;$x<strlen($bars);$x++) {
?? if (($x<10) || ($x>=45 && $x<50) || ($x >=85)) { $sh=10; } else { $sh=0; }
?? if ($bars[$x] == '1') { $color = $fg; } else { $color = $bg; }
?? ImageFilledRectangle($img,($x*$lw)+15,5,($x+1)*$lw+14,$hi+5+$sh,$color);
?? }
?? /* Add the Human Readable Label */
?? ImageString($img,4,$hi-5,$code[0],$fg);
?? for ($x=0;$x<5;$x++) {
?? ImageString($img,$lw*(13+$x*6)+15,$hi+5,$code[$x+1],$fg);
?? ImageString($img,$lw*(53+$x*6)+15,$code[$x+6],$fg);
?? }
?? ImageString($img,$lw*95+17,$code[11],$fg);
?? /* Output the Header and Content. */
?? header("Content-Type: image/png");
?? ImagePNG($img);
??}
??
??UPCAbarcode('12345678901');
??
???>

（编辑：李大同）

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