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<?php $test = 'a b c'; list($a ) = explode(' ', $test); var_dump($a, $b);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined variable $b in /in/bmCTg on line 4 string(1) "a" NULL
Output for 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.4 - 7.4.33
Notice: Undefined variable: b in /in/bmCTg on line 4 string(1) "a" NULL
Output for 7.3.32 - 7.3.33
string(1) "a" NULL

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