Premenstrual dysphoric disorder (PMDD) is a severe, sometimes disabling extension of premenstrual syndrome (PMS). Although regular PMS and PMDD both have physical and emotional symptoms, PMDD causes extreme mood shifts that can disrupt your work and damage your relationships.remenstrual dysphoric disorder (PMDD) is a severe, sometimes disabling extension of premenstrual syndrome (PMS). Although regular PMS and PMDD both have physical and emotional symptoms, PMDD causes extreme mood shifts that can disrupt your work and damage your relationships.
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ctype_alnum() is a godsend for quick and easy username/data filtering when used in conjunction with str_replace(). Let's say your usernames have dash(-) and underscore(_) allowable and alphanumeric digits as well. Instead of a regex you can trade a bit of performance for simplicity: <?php.