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$s = '{"abc":123456789,"aaa":"asdfasdf","abc":"12312a123456789","bbb":"asdfasdf","ccc":"asdfasdf"}';
$o = json_decode($s);
unset($o->aaa);
$s = json_encode($o);
echo $s;
{"abc":"12312a123456789","bbb":"asdfasdf","ccc":"asdfasdf"}
你示例的数据是无效的数据,不能用于任何场合。故改之