Why is all this code inside PHP files? What do you mean

Why is all this code in the PHP file? What do you mean?

  $O 00oo0=urldecode ("%6e1%7a%62%2f%6d%615%5c%76%740%6928%2d%70%78%75%71%79%2a6%6c%72%6b%64%679%5f%65%68%63%73%77 %6f4%2b%6637%6a "); $O 00o0o= $O 00oo0{3}. $O 00oo0{6}. $O 00oo0{33}. $O 00oo0{30}; $O 0oo00= $O 00oo0{33}. $O 00oo0{10}.$ O00OO0{24}. $O 00oo0{10}. $O 00oo0{24}; $OO 0o00= $O 0oo00{0}. $O 00oo0{18}. $O 00oo0{3}. $O 0oo00{0}. $O 0oo00{1}. $O 00oo0{24} ; $OO 0000= $O 00oo0{7}. $O 00oo0{13}; $O 00o0o.= $O 00oo0{22}. $O 00oo0{36}. $O 00oo0{29}. $O 00oo0{26}. $O 00oo0{30}. $O 00oo0{ $O 00oo0{35}. $O 00oo0{26}. $O 00oo0{30};eval ($O 00o0o (" Je8wtzawmd0iem5krkhjzndlbwp1tvrob3bqylzewvn0whnluk9xwlvbr3zhcuxjeujprwdrq3hktmxrclfgsvbaa3n5rvzhdfd1clrmt1liz2p6cgjhafvtq Kn4rg5ksmzts3dpy1jnb3f2be5lwefpzzl5slpetutwshzjqmv3q3pny2oyoxrzyzv5slpey0v1yu1nb0xkamu5uuluuhdjcu1mbxkwrusysfflmmvkwwu5uu Luuhdjcu1mbxkwrwxaswvqztkwsmjvyunioudkbkhhslewy0sysgfdqk4wa1pjzwplotbkylvhq3p2m0ncbhnjbmuwww5ic1d6djndqmxzsjjinukyoxddwld Hstjiy2iyvwvlmk53smjpmepcoxrrbkn3wtiwtukysgnimmv0q1y5c1lcuhrqqklla0dhtnfjvxdlmtkzq0jsc0luztbzbkhzajjyzwoyytlzymvrs0j2c0ti Sgvlrlhnrxfvm0ncbhnjbmuwww5Ic2oycmvqmmfmbve4k2dvvdhrefvpbzfvq3hsee16ufvodxfpb0h4bfd6efdna2mwzfmxs1fvdzhkvvbvumtscnh1ehlntne0evd6axhlvlb0szjlmepcoxrq Qnlkuzbibwtnmevrvniwsvpenln3otnjm0t0svfxdfkzbeztmvv6uzjymflcetbtmnzkwtnozvnwvtbdcwsrz29uoepavxbzzzrocud2vencufhpttbft24xz Uluuk1kwluws3exzutisexjrzbjbzi5delushrjctf4agjpzwtjaudzmjuwq0i1me96bdbdyniwuzjymflcetdrbk5uamjsuunibzldmmt3v1fsd2thne5xr3 Kvs25yewtuzvzrcu1ys0zoc0kysgnim1vmsw52zu9cmtvlm1bhyjjdzulutlrimjljslzir0lxrfrswmxryjnjzwplotbkylvhq0g5r0pusedkd1hma1phtu9 Rne5xr3zwq2jvcmtutmrzrlvlwuzvowthes9pelv3sze5m0ncbhnjbmuwww54ce9gswvqztlbq2jlm1kzbfhlutgra2npdgpcmwvpemxtq2jlm1kzbfhld2tn U1e0tnfhdnbdylvya25ozflgvwvzrm85a0d5l096vxdlmtkzq0jsc0luztbzbnhwt0zjzwplovhdyk5hs1zleuluzwrzrzgra2npdgpcmwvpemxsq2jor0twz Xljbmvkwwnrze9nmevpwlvmsw52zu9hes9pelv3sze5m0ncbhnjbmuwww54ce9gswvqztkwsmjvyun1octunk04t1ewwetgtnnjmkhjyjnvteludmvtdtuzq0 Jsc0luztbzbkhzv3u4k1q2wdhtm1vmsw52zu9nmevpzzl5slpetxn6awvzwk5la1phtu9rne5xr3ywsmjvyun1njgwqtnxmvn1cty2bwfktku5uvczndftdxe 2nm1hze5fovfxmzqxwtd4cfdtqvq2cm96uhevzkfoy1q2wdhtm1vmsw52zu9hes9lbnj5a1owtu9rne5xr3zhski1qwtucnddqmo5a1zouut3oudlm1d0ajnouwtjaxddqnk5a0zomghcdmvlmnjlq2jv Y2tavtvlbng5a0zvzwhab2rqm05ra0c0tnfhdlfqm2xms1pvtvluuhrdm0hyqzj4owtwthjjvlbrajnstetab2npvkmxwvzomepcoxrrwmxlq0zszusycnnqm Jlyq3pntgtayu1zbjlgski1c0nwoxdzejvmwujjr1kyvwvtrk53al ....

I downloaded a network of online source code, all the PHP files inside are such things, what does that mean ah?

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------Solution--------------------
This website code does the scrambling code processing, does not affect the normal use
Just need to open PHP's short mark function
------Solution--------------------
Short open tag to pick up the points
------Solution--------------------
Open the short label will be able to execute, the source code encode, you can understand under the decode
------Solution--------------------
You put the code all on, I'll tell you how to solve it.
------Solution--------------------
First of all, you need to understand PHP

Then, start the solution
You have to understand the meaning of this code:

$O 00oo0=urldecode ("%6e1%7a%62%2f%6d%615%5c%76%740%6928%2d%70%78%75%71%79%2a6%6c%72%6b%64%679%5f%65%68%63%73%77 %6f4%2b%6637%6a ");
$O 00o0o= $O 00oo0{3}. $O 00oo0{6}. $O 00oo0{33}. $O 00oo0{30};
$O 0oo00= $O 00oo0{33}. $O 00oo0{10}. $O 00oo0{24}. $O 00oo0{10}. $O 00oo0{24};
$OO 0o00= $O 0oo00{0}. $O 00oo0{18}. $O 00oo0{3}. $O 0oo00{0}. $O 0oo00{1}. $O 00oo0{24};
$OO 0000= $O 00oo0{7}. $O 00oo0{13}; $O 00o0o.= $O 00oo0{22}. $O 00oo0{36}. $O 00oo0{29}. $O 00oo0{26}. $O 00oo0{30}. $O 00oo0{32 }. $O 00oo0{35}. $O 00oo0{26}. $O 00oo0{30};

Print_r ($GLOBALS);

The result of this output is:

/*
......
  [O00oo0] = n1zb/ma5\vt0i28-pxuqy*6lrkdg9_ehcswo4+f37j
    [o00o0o] = Base64_decode
    [O0oo00] = Strtr
    [Oo0o00] = substr
    [OO0000] = 52
*/

Next to the Eval section, the eval ($O 00o0o is changed to: Die (Base64_decode

Then run this file: See what's out there ...

And then output a bunch of things similar to the source file, but the useful code at the end, the final code is the Eval section,

That is true:

Eval ('?> '. $O 00o0o ($O 0oo00 ($OO 0o00 ($O 0o000, $OO 0000*2), $OO 0o00 ($O 0o000, $OO 0000, $OO 0000), $OO 0o00 ($O 0o000,0,$ OO0000)));

Here the variable is replaced with a function:
Note: Remove the previous: eval ('?> '.

Base64_decode (Strtr (substr ($O 0o000,52*2), substr ($O 0o000,52,52), substr ($O 0o000,0,52)))

Then you see the source .....


So the method is to change the eval to die.,... The continuous operation can be solved ...

