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po #2
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epeee
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epeea. B aepoe ca o coo, oa o-o oop o PHP o e  acoe pecaee. Ceo oac paccaa opoo o o. aae peca eoy apy ayy, a pe oopo acao - my_variable. peca? Oo. Teep a yo ee op,  ya o e  e aoe. He yy oo ya ac, opae ee   yay, a oopo acao: " - aee epeeo". Peya:  oy opa o o, o  aye my_variable e yaa a oopo acao " - aee epeeo". Teep aae peca o ce  PHP-oe.
aya, o ec epeea aaec "my_variable" ( epeoe c acoo "o epeea"),  aee y o epeeo " - aee epeeo". aae coa ao PHP-oye:
<?php
// o o ep oye
/*
a PHP, e  yy
ya
*/
# epeee  x ae
$my_variable = " - aee epeeo";
echo $my_variable;
// oe
?>
Ka  ye ae, epeee aac co aa oapa $. ae, e poea ec aae epeeo. aee co pcaa ("pao"),  aoe aee epeeo  oax.
  oaa eppeaopy PHP, o  coae epeey,  pcaae e aee,  ao cyae o ec " - aee epeeo". Koaa echo $my_variable; o a pa aee epeeo. Peyao oo oa ye ac a pae " - aee epeeo".
Co. B aepoe ae, o  pepe ec ee oe-o poe epeex. A o o,  oey oo e a pae ooop  cey pa.
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Teep eoo aco.
Tae epee oo pco ae pyx epeex  coe ae. Hapep:
<?php
$a1 = 5;
$a2 = $a1 - 4;
echo $a2;
?>
B o pepe  pcaae aee epeeo $a1 co 5, a epeeo $a2 paoc epeeo $a1  ca 4.  peyao oo oa ye o a pa ca 1, a a 5-4=1.
paa aae e epeex:
1.  y epeeo oo  o, e co o,  e co ae. Hapep
$userName - ep apa
$m - eep apa
$user-Name - eep apa
$this_is_my_good_variable_userName - eep apa
2. B eax epeex papee TOKO ace y, p,  co oepa "_".
3. ea epeex HE o aac c p  coa oepa.
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Bpoe ce aca. Bce ya.