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PHP 整数をサニタイズする


数字、プラス記号とマイナス記号を除くすべての文字を削除します。

var_dump(filter_var(1, FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var(-1, FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var(+1, FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var(1.00, FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var(+1.00, FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var(-1.00, FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('1', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('-1', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('+1', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('1.00', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('+1.00', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('-1.00', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('1 unicorn', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('-1 unicorn', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var('+1 unicorn', FILTER_SANITIZE_NUMBER_INT));
var_dump(filter_var("!#$%&'*+-=?^_`{|}~@.[]0123456789abcdefghijklmnopqrstuvwxyz", FILTER_SANITIZE_NUMBER_INT));

結果:

string(1) "1"
string(2) "-1"
string(1) "1"
string(1) "1"
string(1) "1"
string(2) "-1"
string(1) "1"
string(2) "-1"
string(2) "+1"
string(3) "100"
string(4) "+100"
string(4) "-100"
string(1) "1"
string(2) "-1"
string(2) "+1"
string(12) "+-0123456789"