{"id":174,"date":"2020-10-08T15:26:17","date_gmt":"2020-10-08T13:26:17","guid":{"rendered":"https:\/\/wiki.activenet.sk\/?p=174"},"modified":"2020-10-08T15:41:59","modified_gmt":"2020-10-08T13:41:59","slug":"php-7-novinky-a-zmeny","status":"publish","type":"post","link":"https:\/\/wiki.activenet.sk\/index.php\/2020\/10\/08\/php-7-novinky-a-zmeny\/","title":{"rendered":"PHP 7 a 7,3 novinky a zmeny"},"content":{"rendered":"\n

Rozhodli sme sa spr\u00edstupni\u0165 V\u00e1m najnov\u0161ie PHP 7 na webhostingovom servery<\/a>. Prin\u00e1\u0161ame V\u00e1m \u010dlanok o zmen\u00e1ch a novink\u00e1ch v php 7.<\/p>\n\n\n\n

\"php<\/a><\/figure><\/div>\n\n\n\n

Tvorcovia PHP sa rozhodli prepracova\u0165 d\u00e1tove \u0161trukt\u00fary, v\u010faka \u010domu
je php7 v\u00fdrazne r\u00fdchlej\u0161ie a menej pam\u00e4\u0165ovo n\u00e1ro\u010dne. Detailnej\u0161ie inform\u00e1cie o
implement\u00e1ci\u00ed n\u00e1jdete na str\u00e1nke https:\/\/wiki.php.net\/phpng-int.<\/p>\n\n\n\n

Ake novinky n\u00e1m prin\u00e1\u0161a PHP 7 ?<\/p>\n\n\n\n

Typov\u00e1 kontrola pro skal\u00e1rne datov\u00e9 typy<\/strong><\/p>\n\n\n\n

Okrem vy\u0161\u0161ieho v\u00fdkonu je asi najv\u00e4\u010d\u0161ia zmena typov\u00e1 kontrola.<\/p>\n\n\n\n

Uvedieme si rovno aj pr\u00edklad:<\/p>\n\n\n\n

<?php<\/em>
function add(int $a, int $b) {<\/em>
             return $a + $b;<\/em>
}<\/em>
add(1, 3);<\/em><\/p><\/blockquote>\n\n\n\n

V pr\u00edpade, \u017ee funkcii pred\u00e1me neplatn\u00e9 premenn\u00e9, dost\u00e1vame chybu: Argument 2 passed to add() must be of the type integer, string given, called in \u2026<\/p>\n\n\n\n

Kontrola d\u00e1tov\u00fdch typov nie ja automatick\u00e1, je potrebne ju na za\u010diatku s\u00faboru uviest:<\/p>\n\n\n\n

<?php
declare(strict_types = 1);<\/p><\/blockquote>\n\n\n\n

Po zapnut\u00ed s\u00fa d\u00e1tove typy kontrolovan\u00e9 aj pri volan\u00ed \u0161tandartn\u00fdch funkci\u00ed.<\/p>\n\n\n\n

<?php
declare(strict_types = 1);
substr(123, 2); \/\/substr() expects parameter 1 to be string, integer given<\/p><\/blockquote>\n\n\n\n

V pr\u00edpade zmeny na d\u00e1tovy typ float<\/em>, prebieha automatick\u00e1 zmena z int<\/em> na float<\/em>. Opa\u010dne to v\u0161ak nefunguje.<\/p>\n\n\n\n

Typy n\u00e1vratov\u00fdch hodn\u00f4t<\/strong><\/p>\n\n\n\n

\u010eal\u0161ou novinkou v PHP7 je mo\u017enos\u0165 definova\u0165 typ navratovej hodnoty u\u017e pri defin\u00edci\u00ed funkcie.<\/p>\n\n\n\n

<?php
function foo(): array {
             return [];
}<\/p><\/blockquote>\n\n\n\n

Pokia\u013e sa rozhodneme poru\u0161i\u0165 zadefinovan\u00fa n\u00e1vratovu hodnotu, dostaneme chybu o nespr\u00e1vnom type n\u00e1vratovej hodnoty.<\/p>\n\n\n\n

V\u00fdnimky namiesto FATAL errorov<\/strong><\/p>\n\n\n\n

V pr\u00edpade nekompatibiln\u00fdch typov premenn\u00fdch dost\u00e1vame v\u00fdnimku a nie Fatal error (Uncaught TypeException). <\/em>Pokial by v\u00fdnika dedila od Exception,<\/em> bolo by ta\u017ek\u00e9 identifikova\u0165 niektor\u00e9 chyby. Preto vznikol nov\u00fd typ v\u00fdnimiek EngineException.<\/em><\/p>\n\n\n\n

Prehodnotenie E_STRICT errorov<\/strong><\/p>\n\n\n\n

V php7 boli jednotliv\u00e9 strict chyby prehodnoten\u00e9 a bud zru\u0161en\u00e9, alebo boli nahraden\u00e9 E_DEPRECATED, E_NOTICE alebo E_WARNING<\/p>\n\n\n\n

Null Coalesce Operator ??<\/strong><\/p>\n\n\n\n

<?php<\/em>
var_dump($_GET[\u201auser\u2018] ?? \u201anobody\u2018); \/\/ string(6) \u201enobody\u201c<\/em><\/p><\/blockquote>\n\n\n\n

Tak\u00fdto v\u00fdraz vracia \u201enobody\u201c aj v pr\u00edpade, ak index premennej GET neexistuje. Ak by sme pou\u017eili operator ? Dostali by sme Notice o nedefinovanom indexe.<\/p>\n\n\n\n

Nov\u00fd porovn\u00e1vac\u00ed oper\u00e1tor \u2013 Spaceship<\/strong><\/p>\n\n\n\n

Porovn\u00e1vac\u00ed operator vracia bud 0 v pr\u00edpade zhody, -1 ak je prvy men\u0161\u00ed a 1 ak je prv\u00fd v\u00e4\u010d\u0161\u00ed.<\/p>\n\n\n\n

<?php \/\/ http:\/\/3v4l.org\/VDBof<\/em>
var_dump(1 <=> 1); \/\/ 0<\/em>
var_dump(1 <=> 2); \/\/ -1<\/em>
var_dump(2 <=> 1); \/\/ 1<\/em>
var_dump((\u201aa\u2018 <=> \u201aa\u2018)); \/\/ 0<\/em>
var_dump((\u201aa\u2018 <=> \u201ab\u2018)); \/\/ -1<\/em>
var_dump((\u201ab\u2018 <=> \u201aa\u2018)); \/\/ 1<\/em><\/p><\/blockquote>\n\n\n\n

Gener\u00e1tor kryptograficky bezpe\u010dn\u00fdch n\u00e1hodn\u00fdch \u010d\u00edsel (CSPRNG)<\/strong><\/p>\n\n\n\n

Vygenerova\u0165 n\u00e1hodn\u00e9 \u010d\u00edslo bolo mo\u017en\u00e9 len pomocou openssl_random_pseudo_bytes() alebo mcrypt_create_iv(), obe funkcie s\u00fa dostupn\u00e9 len po doin\u0161talovan\u00ed roz\u0161\u00edrenia.  Preto v PHP7 vznikli dve nov\u00e9 funkcie:<\/p>\n\n\n\n

random_bytes(int length);<\/em>
random_int(int min, int max);<\/em><\/p><\/blockquote>\n\n\n\n

Anonymn\u00e9 triedy<\/strong><\/p>\n\n\n\n

V novom php7 m\u00f4\u017eeme vytv\u00e1ra\u0165 anonymn\u00e9 triedy:<\/p>\n\n\n\n

<?php <\/em>
$instance = new class(\u201afoo\u2018) {<\/em>
               public $i;<\/em>
               public function __construct($i) {<\/em>
                         $this->i = $i;<\/em>
               }<\/em>
};<\/em>
var_dump($instance); \/\/ object(class@anonymous)#1 (1) { [\u201ei\u201c]=> string(3) \u201efoo\u201c }<\/em><\/p><\/blockquote>\n\n\n\n

Nov\u00e9 PHP 7 n\u00e1m  prin\u00e1\u0161a zop\u00e1r vylep\u0161eni v\u00fdrazne zr\u00fdchlenie. Te\u0161\u00edme sa na reakcie prv\u00fdch pou\u017e\u00edvatelov.<\/p>\n\n\n\n

<\/p>\n\n\n\n

Zdroj: https:\/\/www.speedweb.sk\/blog\/php-7-novinky-a-zmeny\/<\/p>\n\n\n\n

<\/p>\n\n\n\n

PHP 7.3 novinky a zmeny<\/h1>\n\n\n\n

PHP 7.3 n\u00e1m prin\u00e1\u0161a nov\u00e9 u\u017eito\u010dn\u00e9 funkcie, deprecations a mno\u017estvo opravn\u00fdch ch\u00fdb. T\u00e1to verzia php u\u013eah\u010di \u017eivot hlavne webov\u00fdm v\u00fdvoj\u00e1rom<\/strong> .<\/p>\n\n\n\n

<\/p>\n\n\n\n

V tomto \u010dl\u00e1nku poskytneme preh\u013ead o funkci\u00e1ch a zmen\u00e1ch, ktor\u00e9 osobne pova\u017eujeme za najzaujimavejsie. \u00dapln\u00fd zoznam nov\u00fdch funkci\u00ed, zmien a opraven\u00fdch ch\u00fdb n\u00e1jdete na pozn\u00e1mkach upgradu<\/a> a na str\u00e1nke RFC n\u00e1vrhu PHP 7.3<\/a>.<\/p>\n\n\n\n

\u010co je nov\u00e9 v PHP 7.3?<\/h2>\n\n\n\n

<\/h2>\n\n\n\n

V tomto clanku sa pozrieme na nasleduj\u00face zmeny PHP 7.3:<\/p>\n\n\n\n