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run code in 300+ PHP versions simultaneously
<?php $tmp1 = ['foo' => [['a' => 'a1Value', 'b' => 'b1Value'], ['a' => 'a1Value', 'b' => 'b1Value']]]; $tmp2 = ['foo' => [['a' => 'a1Value', 'b' => 'b1Value'], ['a' => 'a1Value', 'b' => 'b1Value']]]; foreach ($tmp1['foo'] as &$v) { unset($v['b']); } foreach ($tmp2['foo'] ?? [] as &$v) { unset($v['b']); } var_dump($tmp1); var_dump($tmp2);

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