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<?php var_dump(iconv_substr('',0,10,'utf-8')); var_dump(substr('',0,10)); var_dump(mb_substr('',0,10));
Output for 7.0.11 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
string(0) "" string(0) "" string(0) ""
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 string(0) "" string(0) "" string(0) ""
Output for 7.3.32 - 7.3.33, 7.4.33, 8.0.13
Fatal error: Uncaught Error: Call to undefined function iconv_substr() in /in/Q52RB:3 Stack trace: #0 {main} thrown in /in/Q52RB on line 3
Process exited with code 255.
Output for 7.0.0 - 7.0.10
bool(false) string(0) "" string(0) ""
Output for 5.2.2 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.34, 5.6.0 - 5.6.40
bool(false) bool(false) string(0) ""
Output for 5.5.35 - 5.5.38
Fatal error: Call to undefined function iconv_substr() in /in/Q52RB on line 3
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.1
string(0) "" bool(false) string(0) ""
Output for 5.0.0 - 5.0.5
Notice: iconv_substr(): Unknown error (0) in /in/Q52RB on line 3 bool(false) bool(false) string(0) ""
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: iconv_substr() in /in/Q52RB on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.4
Fatal error: Call to undefined function: iconv_substr() in /in/Q52RB on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: iconv_substr() in /in/Q52RB on line 3

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