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I have an older Debian server and a local install of Wordpress; I'm trying to track down why calling:

echo json_encode('😀');

on the Debian server results in "\ud83dde00" but on my local install, calling the same json_encode line results in "\ud83d\ude00" (which is what I'd expect to see on the Debian server too)...

Both versions of php are compiled with mbstring=all enabled, and both use libmbfl version 1.3.2

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    No PHP versions or distro versions or anything? – Michael Hampton Apr 18 '18 at 10:28
  • The Debian php is compiled from source (php-5.6.33) using ./configure --prefix=/usr/local/php5.6.33 --disable-all --with-libxml-dir=/usr/include/libxml2/libxml --with-openssl --with-pcre-regex --with-zlib --with-curl --enable-ftp --with-jpeg-dir --with-png-dir --with-xpm-dir --enable-mbstring=all --with-iconv --with-mysql --with-pear --enable-filter --enable-xml --enable-libxml --enable-simplexml --enable-hash --enable-dom --enable-ctype --with-gd=/usr/local so I'm guessing it must be some other older system library that's at fault? – jaygooby Apr 18 '18 at 10:32
  • I'm not even sure what \ud83dde00 as a value is? Is that UTF16 instead of UTF8? – jaygooby Apr 18 '18 at 10:33
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Facepalm. Because I had --disable-all the json module wasn't being compiled in, so adding --enable-json and recompiling then means that echo json_encode('😀'); now returns "\ud83d\ude00"

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