<?php $x = [ 123 => ['name' => 'xxx'], 456 => ['name' => 'yyy'], ]; echo \array_key_exists(123, $x) ? 'yes' : 'no'; echo "\n"; $x = [ ['id' => 123, 'name' => 'xxx'], ['id' => 456, 'name' => 'yyy'], ]; // if array child id === 123 in any of the children, // then echo yes, // (without using a loop, and by using an array function)
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