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run code in 200+ php & hhvm versions
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<?php $string = 'goofe eas تان ک'.chr( bindec( '11111100' ) ).'ے عسکری ذرائع کے مطابق بدھ' .chr( bindec( '11011111' ) ); echo mb_substr( $string , 6 , null , 'utf-8' )."\n"; echo mb_substr( $string , 6 , 4 , 'utf-8' )."\n"; echo mb_substr( $string , 6 , -4 )."\n"; echo mb_substr( $string , -4 , null , 'utf-8' )."\n"; mb_internal_encoding( 'utf-8' ); echo mb_substr( $string , 6 )."\n"; echo mb_substr( $string , 6 , 4 )."\n"; echo mb_substr( $string , 6 , -4 )."\n"; echo mb_substr( $string , -4 )."\n"; exit(0);