<?php var_dump(strtolower('Déjàvü') === strtolower('déJàVü')); // true var_dump(strtolower('Déjàvü') === strtolower('DÉJÀVÜ')); // false var_dump(strtolower('déJàVü') === strtolower('DÉJÀVÜ')); // false var_dump(strcasecmp('Déjàvü', 'déJàVü')); // true var_dump(strcasecmp('Déjàvü', 'DÉJÀVÜ'));// false var_dump(strcasecmp('déJàVü', 'DÉJÀVÜ')); // false
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