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<?php $str = '8166, 7335, 4747, 7766, 8520, 4748, 8176, 8337, 4762, 8248, 4001, 4784, 8163, 8247, 4801, 8458, 8464, 4805, 157716, 4384, 4808, 8448, 8246, 4834, 8165, 7290, 4847, 9069, 4530, 4893, 8331, 7234, 4906, 8133, 4704, 8341, 7250, 4710, 7233, 7235, 4718, 7249, 8974, 4733, 8264, 8890, 8162, 4742, 4954, 7614, 7318, 8167, 8417, 4731, 162211, 8250, 162210, 8249, 4038, 4850, 7336, 4085, 8681, 8875, 8523, 8978, 8682, 8684, 7783, 8168, 4312, 8295, 7574, 4330, 8440, 8977, 4431, 8975, 7784, 4478, 162209, 8891, 7325, 4490, 8683, 4503, 4984, 4523, 8976, 8427, 8897, 7785, 8896, 8797, 159962, 4917, 4919, 4921, 4923, 159989, 4925, 159992, 8799, 8798, 159990, 8800, 8801, 8802, 159991, 4194, 4989, 3984, 4728, 8339, 4904, 9074, 8457, 8259, 8456, 8224, 8492, 8346, 8183, 8291, 8223, 8253, 157714, 8354, 8236, 9078, 3982, 8343, 8470, 8256, 4163, 9080, 8496, 8229, 8181, 8179, 8970, 8491, 8471, 8182, 8675, 8258, 9079, 8257, 8497, 8180, 162206, 8933, 7585, 4031, 4201, 4366, 4463, 4614, 4622, 8973, 7735, 7322, 8178, 9073, 7468, 8332, 3993, 4654, 8185, 4025, 9071, 7310, 4026, 4964, 8972, 9077, 4773, 8355, 4173, 4785, 8923, 4255, 4824, 8015, 8335, 9076, 157783, 4382, 8418, 9072, 9075, 9070, 8177, 4432, 8251, 8194, 4465, 8342, 8334, 8333, 7311, 7169, 4507, 7572, 8454, 4527, 8186, 8296, 157782, 8670, 4698, 7922, 4700, 157336, 4701, 8222, 157826, 8221, 4798, 8217, 4887, 9082, 9081, 3950, 4092, 4127, 4128, 4228, 4253, 4434, 4476, 8216, 4691, 8971, 7236, 8173, 3956, 4231, 4618, 8016, 159173, 7712, 8171, 4012, 4236, 4630, 7546, 8874, 7823, 8252, 8452, 4039, 8190, 9119, 7782, 8187, 7475, 8188, 4976, 7767, 4331, 7168, 7717, 7732, 8172, 8467, 4977, 9098, 4350, 8170, 7326, 7768, 128768, 4986, 4058, 4389, 4754, 162208, 7711, 8328, 4988, 4073, 7476, 4823, 7606, 8469, 7321, 4992, 8254, 4417, 4841, 8455, 7713, 8245, 7780, 7824, 4481, 8449, 7825, 7643, 7323, 7477, 162207, 9068, 4965, 8191, 8164, 7331, 7716, 4132, 4498, 7932, 7953, 8451, 8189, 8468, 9161, 4555, 8184, 7921, 7573, 8495, 4191, 8126, 4966, 8490, 8450, 7545, 8072, 7733, 7715, 7779, 7714, 8324, 7547, 3953, 8192, 8453, 128769, 8244, 8255, 160927, 3955, 8174, 4606, 159955, 8895, 4087, 4647, 157865, 4226, 4715, 157781, 4268, 8419, 157779, 4270, 7730, 8898, 4291, 8899, 159956, 4303, 7327, 157780, 121746, 8893, 121747, 7332, 8894, 4981, 9118, 8420, 4526, 157871, 157866, 3959, 4574, 3961, 4579, 3977, 4599, 7731, 4027, 4607, 8429, 7413, 7414, 7415, 8329, 8465, 8330, 9083, 8263, 7629, 8105, 155876, 160619, 8485, 8405'; $elementsIds = explode(', ', $str); $diff = [ 8166, 7335, 4747 ]; print_r(array_diff($diff, $elementsIds));