Ka\u017ed\u00fd programovac\u00ed jazyk pracuje s nejak\u00fdmi hodnotami. To do \u010doho tieto hodnoty uklad\u00e1me naz\u00fdvame premenn\u00e9. Ka\u017ed\u00e1 premenn\u00e1 ma svoj jedine\u010dn\u00fd n\u00e1zov a hodnotu, ktor\u00e1 sa m\u00f4\u017ee po\u010das behu programu meni\u0165.<\/p>\n
Ka\u017ed\u00e1 premenn\u00e1 v jazyku PHP za\u010d\u00edna znakom\u00a0$<\/strong>. Premenn\u00e9 rozde\u013eujeme pod\u013ea toho, ak\u00e9 hodnoty do nich uklad\u00e1me:<\/p>\n V mnoh\u00fdch jazykoch treba premenn\u00e9 deklarova\u0165, ale v jazyku PHP podobne, ako v JavaScripte typ premenn\u00fdch netreba deklarova\u0165.<\/p>\n Ako vid\u00edte najprv som premennej priradil nejak\u00fa hodnotu a potom som ju vyp\u00edsal. Nasleduj\u00faci pr\u00edklad obsahuje naj\u010dastej\u0161ie sa vyskytuj\u00face chyby pri p\u00edsan\u00ed premenn\u00fdch:<\/p>\n Pozn\u00e1mka:<\/em> Ka\u017ed\u00fd programovac\u00ed jazyk pracuje s nejak\u00fdmi hodnotami. To do \u010doho tieto hodnoty uklad\u00e1me naz\u00fdvame premenn\u00e9. Ka\u017ed\u00e1 premenn\u00e1 ma svoj jedine\u010dn\u00fd n\u00e1zov a hodnotu, ktor\u00e1 sa m\u00f4\u017ee po\u010das behu programu meni\u0165. Ka\u017ed\u00e1 premenn\u00e1 v jazyku PHP za\u010d\u00edna znakom\u00a0$. Z\u00e1kladn\u00e1 syntax: <? $nazov_premennej = hodnota; ?> Premenn\u00e9 rozde\u013eujeme pod\u013ea toho, ak\u00e9 hodnoty do nich uklad\u00e1me: Typ N\u00e1zov […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-342","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/gdm.sosthe.sk\/index.php?rest_route=\/wp\/v2\/pages\/342","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gdm.sosthe.sk\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/gdm.sosthe.sk\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/gdm.sosthe.sk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gdm.sosthe.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=342"}],"version-history":[{"count":1,"href":"https:\/\/gdm.sosthe.sk\/index.php?rest_route=\/wp\/v2\/pages\/342\/revisions"}],"predecessor-version":[{"id":343,"href":"https:\/\/gdm.sosthe.sk\/index.php?rest_route=\/wp\/v2\/pages\/342\/revisions\/343"}],"wp:attachment":[{"href":"https:\/\/gdm.sosthe.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=342"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nZ\u00e1kladn\u00e1 syntax:<\/p>\n<?\r\n $<\/strong>nazov_premennej = hodnota; \r\n ?><\/pre>\n
\n\n
\n Typ<\/strong><\/td>\n N\u00e1zov<\/strong><\/td>\n Popis<\/strong><\/td>\n<\/tr>\n \n Logick\u00fd<\/td>\n Bool<\/strong><\/td>\n uchov\u00e1va hodnotu pravda, nepravda a zapisuje sa, ako true\/ false<\/td>\n<\/tr>\n \n Celo\u010d\u00edseln\u00fd<\/td>\n Integer<\/strong><\/td>\n d\u00e1tov\u00fd typ pre cel\u00e9 \u010d\u00edsla ( 4 byty \u2013
\nrozsah od -2 147 483 648 do +2 147 483 647.<\/td>\n<\/tr>\n\n Re\u00e1lne \u010d\u00edsla<\/td>\n Double<\/strong><\/td>\n re\u00e1lne (desatin\u00e9) \u010d\u00edsla ( 5 bytov \u2013 rozsah od
\n-1,7.10e308 do 1,7.10e308 \u2013 k dispoz\u00edcii je 15 \u010d\u00edslic ) Desatin\u00fa \u010diarku zapisujeme pomocou bodky.<\/td>\n<\/tr>\n\n Znaky<\/td>\n String<\/strong><\/td>\n re\u0165azec znakov<\/td>\n<\/tr>\n \n Viac polo\u017eiek<\/td>\n Array<\/strong><\/td>\n pole s viacer\u00edmi polo\u017ekamy<\/td>\n<\/tr>\n \n Objekt<\/td>\n Object<\/strong><\/td>\n objekty pre ukladanie instancii tried<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n <?\r\n $prva<\/strong> = true; \/\/ logick\u00fd typ - bool\r\n $druha<\/strong> = 10; \/\/ celo\u010d\u00edseln\u00fd typ - integer\r\n $tretia<\/strong> = 10.001; \/\/ re\u00e1lne (desatinn\u00e9) \u010d\u00edslo - double\r\n $stvrta<\/strong> = \"Text\"; \/\/ re\u0165azec znakov - string\r\n echo $prva .\"<br>\";\r\n echo $druha .\"<br>\";\r\n echo $tretia .\"<br>\";\r\n echo $stvrta .\"<br>\";\r\n ?><\/pre>\n
<?\r\n $3sestry = \"tri sestry\"; \/\/ premenn\u00e1 sa nesmie nikdy za\u010d\u00edna\u0165 \u010d\u00edslom ( ERROR )\r\n $rok = 2007;\r\n echo $Rok; \/\/ pri premenn\u00fdch rozli\u0161ujeme ve\u013ek\u00e9 a mal\u00e9 p\u00edsmen\u00e1 ( nevyp\u00ed\u0161e ni\u010d )\r\n ?><\/pre>\n
\nKa\u017ed\u00e1 premenn\u00e1 by mala by\u0165\u00a0inicializovan\u00e1<\/em>\u00a0( m\u00e1 ma\u0165 hodnotu hne\u010f pri prvom pou\u017eit\u00ed ). Neinicializovan\u00e1 premenn\u00e1 m\u00e1 d\u00e1tov\u00fd typ\u00a0pr\u00e1zdneho re\u0165azca<\/em>.<\/p>\n$auto; \/\/ neinicializovan\u00e1 premenn\u00e1 pr\u00e1zdneho re\u0165azca\r\n $auto = Renault; \/\/ inicializovan\u00e1 premenn\u00e1 Renault<\/pre>\n","protected":false},"excerpt":{"rendered":"