zend_ast: Escape control bytes in exported string literals#22350
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The AST pretty-printer rendered string literals in single quotes, appending each byte verbatim. A literal containing a NUL kept the byte in the resulting string, but assert() hands that string to zend_throw_exception() as a const char*, so the failure message was truncated at the first NUL (the closing of the expression was lost). Render literals that contain a control byte double-quoted via zend_ast_export_qstr(), which escapes those bytes as octal. The embedded NUL no longer survives, so the message is complete, and the byte is shown in escaped form. Strings without control bytes are unchanged. Fixes phpGH-22290
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The AST pretty-printer rendered string literals single-quoted with raw bytes. A literal containing a NUL kept the byte in the resulting zend_string, but assert() passes that string to zend_throw_exception() as a const char*, so the failure message was truncated at the first NUL (the rest of the expression was lost).
Render literals that contain a control byte double-quoted via zend_ast_export_qstr(), which escapes those bytes as octal, so no embedded NUL survives and the message is complete. Strings without control bytes are unchanged.
Fixes GH-22290