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<?php $test1 = '07511 111111'; $test2 = '+447511 111111'; $test3 = '+44 (0) 7511 111111'; //step 1 - reduce it to digits: preg_match_all('([\+]{0,1}[0-9+])', $test1, $digits); var_dump($digits);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { [0]=> array(11) { [0]=> string(1) "0" [1]=> string(1) "7" [2]=> string(1) "5" [3]=> string(1) "1" [4]=> string(1) "1" [5]=> string(1) "1" [6]=> string(1) "1" [7]=> string(1) "1" [8]=> string(1) "1" [9]=> string(1) "1" [10]=> string(1) "1" } }

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