PHP code generation Implementation Program

Barcode is a graphical identifier used to express a set of information by arranging multiple black bars and white spaces in different widths according to certain encoding rules. A common bar code is a parallel line between black bars (short bars) and white bars (empty bars) with a large difference in reflectivity. After a rough understanding of the above, next we can re-integrate the Code to make it easier to use.

The Code is as follows:

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<? Php Function UPCAbarcode ($ code) { $ Lw = 2; $ hi = 100; $ Lencode = array ('20140901', '20160901', '20160901', '20160301', '20160301 ', '123', '123', '123', '123', '123 '); $ Rencode = array ('20140901', '20160901', '20160901', '20160301', '20160301 ', '123', '123', '123', '123', '123 '); $ Ends = '20180101'; $ center = '20180101 '; /* 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, 0, 0 ); $ Bg = ImageColorAllocate ($ img, 255,255,255 ); ImageFilledRectangle ($ img, 0, 0, $ 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, 4,5, $ hi-5, $ code [0], $ fg ); For ($ x = 0; $ x <5; $ x ++) { ImageString ($ img, 5, $ lw * (13 + $ x * 6) + 15, $ hi + 5, $ code [$ x + 1], $ fg ); ImageString ($ img, 5, $ lw * (53 + $ x * 6) + 15, $ hi + 5, $ code [$ x + 6], $ fg ); } ImageString ($ img, 4, $ lw * 95 + 17, $ hi-5, $ code [11], $ fg ); /* Output the Header and Content .*/ Header ("Content-Type: image/png "); ImagePNG ($ img ); } UPCAbarcode ('20140901 '); ?>