string using \u as that codepoint's UTF-8 representation in php

Question

In PHP manual stated that

\u{[0-9A-Fa-f]+} the sequence of characters matching the regular expression is a Unicode codepoint, which will be output to the string as that codepoint's UTF-8 representation (added in PHP 7.0.0)

echo "\101";  //Output A

echo "\x41";  // Output A

echo "\u0041"; //But its now working. output same as \u0041

i am unable to understand \u

Ernst Zwingli · Answer 1 · 2017-11-21T07:58:32.143

0

I suggest to read through this well explaining blog post of the current CEO of stackoverflow (funny coincidence).

Basically to quote the relevant part (about the "u"):

The U+ means “Unicode” and the numbers are hexadecimal. U+0639 is the Arabic letter Ain. The English letter A would be U+0041.

UPDATE

Your problem seems actually connected to a missing implementation between PHP 7.0 and PHP 7.2 -> Read this SO-Answer here

edited Nov 21 '17 at 07:58

answered Nov 21 '17 at 07:28

Ernst Zwingli

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echo "\u+0041" does not work. give same output \u+0041 – Dhairya Lakhera Nov 21 '17 at 07:31
yep. Just recognized. What's your PHP-Version? – Ernst Zwingli Nov 21 '17 at 07:33
PHP version 7.1 – Dhairya Lakhera Nov 21 '17 at 07:33
just recognized, you spared the `+` at the end of the sequence. Does it work, when you add it? – Ernst Zwingli Nov 21 '17 at 07:44
Ah... found it in [this SO post here](https://stackoverflow.com/a/36902105/8683679). It has nothing to do with a wrong syntax but with missing utf8-functions in PHP in betwee 7.0.x and 7.2.0 – Ernst Zwingli Nov 21 '17 at 08:00

string using \u as that codepoint's UTF-8 representation in php

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