Font that supports all utf-8 characters for php imagettftext

As Brian Neal stated in his comments, UTF-8 is just one of several encoding standards that can represent every character in the Unicode character set, which currently contains more than 100000 entries.

So you are actually asking for a true type font that supports all 100k+ unicode characters currently in use on this planet (and it's a moving target, as the set gets expanded and adjusted constantly).

So I guess the literal answer is no, and you should probably check your preconditions (what character subsets are likely encountered in your use case), and search for a fitting multi-purpose font.

However, there are attempts to provide fonts that cover large amounts of the unicode space - search for 'Pan-Unicode Fonts' to get an overview.

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☕ (U+2615 - 'Hot Beverage' ;)

The closest you can get is Google Noto Fonts.

Sans and Serif support 582 languages while Mono supports 212 languages.

Link and more information here: https://www.google.com/get/noto/