Online PHP editor | output for C9im4

Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.34, 5.6.7 - 5.6.20, 5.6.28 - 5.6.40, 7.0.0 - 7.0.5, 7.0.20 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 8.0.0 - 8.0.12: string(2) "a" string(2) "a"
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: iconv_substr() in /in/C9im4 on line 3
Output for 4.3.0 - 4.3.1, 4.3.2 - 4.3.11, 4.4.0 - 4.4.4: Fatal error: Call to undefined function: iconv_substr() in /in/C9im4 on line 3
Output for 5.5.35, 5.6.21: Fatal error: Call to undefined function iconv_substr() in /in/C9im4 on line 3
Output for 7.0.6, 7.3.32 - 7.3.33, 7.4.33, 8.0.13, 8.5.1 - 8.5.11: Fatal error: Uncaught Error: Call to undefined function iconv_substr() in /in/C9im4:3 Stack trace: #0 {main} thrown in /in/C9im4 on line 3
Output for 7.4.26 - 7.4.32: Notice: iconv_substr(): Wrong charset, conversion from `UTF-16LE' to `UCS-4LE' is not allowed in /in/C9im4 on line 3 bool(false) Notice: iconv_substr(): Wrong charset, conversion from `UTF-16BE' to `UCS-4LE' is not allowed in /in/C9im4 on line 4 bool(false)
Output for 8.0.14 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0: Warning: iconv_substr(): Wrong encoding, conversion from "UTF-16LE" to "UCS-4LE" is not allowed in /in/C9im4 on line 3 bool(false) Warning: iconv_substr(): Wrong encoding, conversion from "UTF-16BE" to "UCS-4LE" is not allowed in /in/C9im4 on line 4 bool(false)