serialization - PHP serialize() output for number is whack -


i calculating size of file upload in php, format in mb 1 decimal place so:

$metadata['upload_data'] = intval($_files['filedata']['size'] / 104857.6) / 10;

when echo $metadata['upload_data'] output 1.7 expect. when serialize array serialize($metadata) , save file, output is:

a:2:{s:7:"uploads";i:11;s:11:"upload_data";d:1.6999999999999999555910790149937383830547332763671875;}

i'm trying efficient storing file sizes in mb not bytes, seems worse! why php store way? , going right way? thanks

from manual: http://php.net/manual/en/language.types.float.php

additionally, rational numbers representable floating point numbers in base 10, 0.1 or 0.7, not have exact representation floating point numbers in base 2, used internally, no matter size of mantissa. hence, cannot converted internal binary counterparts without small loss of precision. can lead confusing results: example, floor((0.1+0.7)*10) return 7 instead of expected 8, since internal representation 7.9999999999999991118....

i suggest using json_encode , json_decode if want see "1.7" in serialized version of array. these functions end being quicker serialize , unserialize , easier read (by easier read, mean person reading them, rather machine).


Comments

Post a Comment

Popular posts from this blog

c# - SharpSVN - How to get the previous revision? -

i trying find efficient way previous revision of file text comparison using sharpsvn. using (svnclient c = new svnclient()) { c.authentication.defaultcredentials = new networkcredential( configurationmanager.appsettings.get("svnserviceusername") , configurationmanager.appsettings.get("svnservicepassword") , configurationmanager.appsettings.get("svnservicedomain") ); c.authentication.sslservertrusthandlers += new eventhandler<svnsslservertrusteventargs>(authentication_sslservertrusthandlers); collection<svnfileversioneventargs> fileversioncollection = new collection<svnfileversioneventargs>(); svnrevisionrange range = new svnrevisionrange(0, this.hooks.revision); svnfileversionsargs args = new svnfileversionsargs(); args.retrieveproperties = true; args.range = range; foreach (svnchangeitem item in log.changedpaths) { string path = this.repositorypath + it...
Read more

c++ - Is it possible to compile a VST on linux? -

for class project i'm attempting write vst plugin backed cuda. current cuda workflow on linux box, i'd prefer compile , link there. according wikipedia , should possible (i couldn't find steinberg documentation relevant linux) can't find makefile or instructions on how build if aren't using xcode or visual studio. i'm vst 3 sdk doesn't support linux. when try compile plugin under linux, error: ./base/source/fatomic.cpp:39:30: fatal error: libkern/osatomic.h: no such file or directory this issue caused following code in "vst3 sdk/base/source/fatomic.cpp" #if mac #include <libkern/osatomic.h> #if mac_os_x_version_min_required > mac_os_x_version_10_4 #define native_atomic_type (volatile int32_t*) #else #define native_atomic_type (int32_t*) #endif #elif windows #include <windows.h> #endif but hope compiling under linux work vst sdk 2.4. reading. jvstwrapper seems run on lin...
Read more

url - Querystring manipulation of email Address in PHP -

i using third party application (email2http) send me emailid, body , message. unable retrieve email id due name appended on , enclosed < , >. here querystring getting. test.php?from=ajay+reddy &subject=cx&body=somebody when print variable in php returns name , not email id. $from = $_get['from']; echo $from; //output ajay reddy please suggest me how can emailid also. i dont want use post method due testing , debugging. it's working fine. forgot use htmlentities() in debugging.
Read more