php - Why does `mb_eregi_replace` return NULL when the string contains extended ASCII codes? -


using php v7.1.5, why php function mb_eregi_replace return null if string contains extended ascii code a0 ("non-breaking space" according www.ascii-code.com)?

$ php -a interactive shell  php > $t = mb_eregi_replace('d', '', "do\xa0not"); php > echo $t; php > if( $t === null ) { echo "is null"; } else { echo "replace worked"; } null   php > $t = mb_eregi_replace('d', '', "do not"); php > echo $t; o not php > if( $t === null ) { echo "is null"; } else { echo "replace worked"; } replace worked

reading this article (specifically "what convert extended ascii utf-8" section) shows passing string utf8_encode before passing mb_eregi_replace solves problem.

$ php -a interactive shell  php > $t = mb_eregi_replace('d', '', utf8_encode("do\xa0not")); php > echo $t; o not

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