How does php compress all files in a folder into a zip file?

How does php compress all files in a folder into a zip file? How does php compress all files in a folder into a zip file? For example, my localhosthas a testfolder with many files and folders in it. how can I pack all test.zip files into test.zip ?, How does PHPcodeFunction php compress all files in a folder into a zip file?
How does php compress all files in a folder into a zip file?

For example, my localhost has a test folder with many files and folders in it. how can I package everything in test into test.zip?

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PHP code

Function ReadFileHeader ($ zip) {$ binary_data = fread ($ zip, 30 ); $ data = unpack ('vchk/vid/vversion/vflag/vcompression/vmtime/vmdate/Vcrc/Vcompressed_size/Vsize/vfilename_len/vextra_len ', $ binary_data ); $ header ['filename'] = fread ($ zip, $ data ['filename _ Len']); IF ($ data ['extra _ Len']! = 0) {$ header ['Extra '] = fread ($ zip, $ data ['extra _ Len']);} else {$ header ['Extra '] = '';} $ header ['compression'] = $ data ['compression']; $ header ['size'] = $ data ['size']; $ header ['compressed _ size'] = $ data ['compressed _ size']; $ header ['crc '] = $ data ['crc']; $ header ['flag'] = $ data ['flag']; $ header ['mdate'] = $ data ['mdate']; $ header ['mtime'] = $ data ['mtime']; IF ($ header ['mdate'] & $ header ['mtime']) {$ hou R = ($ header ['mtime'] & 0xF800)> 11; $ minute = ($ header ['mtime'] & 0x07E0)> 5; $ seconde = ($ header ['mtime'] & 0x001F) * 2; $ year = ($ header ['mdate'] & 0xFE00)> 9) + 1980; $ month = ($ header ['mdate'] & 0x01E0)> 5; $ day = $ header ['mdate'] & 0x001F; $ header ['mtime'] = mktime ($ hour, $ minute, $ seconde, $ month, $ day, $ year );} else {$ header ['mtime'] = time ();} $ header ['stored _ filename'] = $ header ['filename' ]; $ Header ['status'] = "OK"; Return $ header;} Function ReadCentralFileHeaders ($ zip) {$ binary_data = fread ($ zip, 46 ); $ header = unpack ('vchkid/vid/vversion/kernel/vflag/vcompression/vmtime/vmdate/Vcrc/kernel/Vsize/kernel/vextra_len/vcomment_len/vdisk/vinternal/Vexternal/ voffset ', $ binary_data); IF ($ header ['filename _ Len']! = 0) $ header ['filename'] = fread ($ zip, $ header ['filename _ Len']); Else $ header ['filename'] = ''; IF ($ header ['extra _ Len']! = 0) $ header ['Extra '] = fread ($ zip, $ header ['extra _ Len']); Else $ header ['Extra'] = ''; IF ($ header ['Comment _ Len']! = 0) $ header ['comment'] = fread ($ zip, $ header ['Comment _ Len']); Else $ header ['comment'] = ''; IF ($ header ['mdate'] & $ header ['mtime']) {$ hour = ($ header ['mtime'] & 0xF800)> 11; $ minute = ($ header ['mtime'] & 0x07E0)> 5; $ seconde = ($ header ['mtime'] & 0x001F) * 2; $ year = ($ header ['mdate'] & 0xFE00)> 9) + 1980; $ month = ($ header ['mdate'] & 0x01E0)> 5; $ day = $ header ['mdate'] & 0x001F; $ header ['mtim E '] = mktime ($ hour, $ minute, $ seconde, $ month, $ day, $ year );} else {$ header ['mtime'] = time ();} $ header ['stored _ filename'] = $ header ['filename']; $ header ['status'] = 'OK'; IF (substr ($ header ['filename'],-1) = '/') $ header ['external '] = 0x41FF0010; Return $ header;} Function ReadCentralDir ($ zip, $ zip_name) {$ size = filesize ($ zip_name ); IF ($ size <277) {$ maximum_size = $ size;} Else {$ maximum_size = 2 77 ;}@ fseek ($ zip, $ size-$ maximum_size); $ pos = ftell ($ zip); $ bytes = 0x00000000; While ($ pos <$ size) {$ byte = @ fread ($ zip, 1); $ bytes = ($ bytes <8) | Ord ($ byte); IF ($ bytes = 0x504b0506) {$ pos ++; break;} $ pos ++;} $ data = unpack ('vdisk/vdisk_start/vdisk_entries/ventries/Vsize/Voffset/vcomment_size ', fread ($ zip, 18); IF ($ data ['Comment _ size']! = 0) {$ centd ['comment'] = fread ($ zip, $ data ['Comment _ size']);} else {$ centd ['comment'] = '';} $ centd ['entries'] = $ data ['entries']; $ centd ['disk _ entries'] = $ data ['disk _ entries']; $ centd ['offset'] = $ data ['offset']; $ centd ['disk _ start'] = $ data ['disk _ start']; $ centd ['size'] = $ data ['size']; $ centd ['disk'] = $ data ['disk']; Return $ centd;} Function ExtractFile ($ header, $ to, $ zip) {$ header = $ this-> re Adfileheader ($ zip); IF (substr ($ to,-1 )! = "/") $ To. = "/"; IF (! @ Is_dir ($ to) @ mkdir ($ to, 0777); $ pth = explode ("/", dirname ($ header ['filename']); for ($ I = 0; isset ($ pth [$ I]); $ I ++) {IF (! $ Pth [$ I]) continue; $ pthss. = $ pth [$ I]. "/"; IF (! Is_dir ($ to. $ pthss) @ mkdir ($ to. $ pthss, 0777);} IF (! ($ Header ['external '] = 0x41FF0010 )&&! ($ Header ['external '] = 16) {IF ($ header ['compression'] = 0) {$ fp = @ fopen ($. $ header ['filename'], 'WB '); IF (! $ Fp) Return (-1); $ size = $ header ['compressed _ size']; While ($ size! = 0) {$ read_size = ($ size <2048? $ Size: 2048); $ buffer = fread ($ zip, $ read_size); $ binary_data = pack ('A '. $ read_size, $ buffer); @ fwrite ($ fp, $ binary_data, $ read_size); $ size-= $ read_size;} fclose ($ fp); touch ($. $ header ['filename'], $ header ['mtime']);} Else {$ fp = @ fopen ($. $ header ['filename']. '.gz ', 'WB'); IF (! $ Fp) Return (-1); $ binary_data = pack ('va1a1va1a1 ', 0x8b1f, Chr ($ header ['compression']), Chr (0x00 ), time (), Chr (0x00), Chr (3); fwrite ($ fp, $ binary_data, 10 ); $ size = $ header ['compressed _ size']; While ($ size! = 0) {$ read_size = ($ size <1024? $ Size: 1024); $ buffer = fread ($ zip, $ read_size); $ binary_data = pack ('A '. $ read_size, $ buffer); @ fwrite ($ fp, $ binary_data, $ read_size); $ size-= $ read_size;} $ binary_data = pack ('vv ', $ header ['crc '], $ header ['size']); fwrite ($ fp, $ binary_data, 8); fclose ($ fp ); $ gzp = @ gzopen ($. $ header ['filename']. '.gz ', 'RB') or die ("Cette archive est compress finished"); IF (! $ Gzp) Return (-2); $ fp = @ fopen ($ to. $ header ['filename'], 'wb'); IF (! $ Fp) Return (-1); $ size = $ header ['size']; While ($ size! = 0) {$ read_size = ($ size <2048? $ Size: 2048); $ buffer = gzread ($ gzp, $ read_size); $ binary_data = pack ('A '. $ read_size, $ buffer); @ fwrite ($ fp, $ binary_data, $ read_size); $ size-= $ read_size;} fclose ($ fp); gzclose ($ gzp ); touch ($. $ header ['filename'], $ header ['mtime']); @ unlink ($. $ header ['filename']. '.gz ') ;}} Return true ;}}