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<?php $a = array(1,2,3); $b = &$a; foreach($a as $i => $v) { echo "$v\n"; $a[0] = 'qqq'; unset($a[1]); } var_dump($a); var_dump($b);
Output for 7.0.0 - 7.0.31, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
1 2 3 array(2) { [0]=> string(3) "qqq" [2]=> int(3) } array(2) { [0]=> string(3) "qqq" [2]=> int(3) }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 1 2 3 array(2) { [0]=> string(3) "qqq" [2]=> int(3) } array(2) { [0]=> string(3) "qqq" [2]=> int(3) }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
1 3 array(2) { [0]=> string(3) "qqq" [2]=> int(3) } array(2) { [0]=> string(3) "qqq" [2]=> int(3) }

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203.8 ms | 402 KiB | 285 Q