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Informations about the package php-ai-text-sanitizer

php-ai-text-sanitizer

A small, dependency-free PHP library that detects and removes invisible watermarks — and other tell-tale characters — that AI providers leave in generated text.

Large language models routinely emit characters that render as nothing but survive copy/paste: zero-width spaces and joiners, Unicode tag characters (U+E0000–E007F) and variation selectors used for steganographic watermarking, bidirectional controls, and unusual spaces such as the narrow no-break space (U+202F). This library strips them, and can optionally normalize the visible typography (smart quotes, dashes, ellipses) that also signals machine authorship.

Install

Usage

One-liner

Configured instance

Clean with a report of what changed

Detect only (don't modify)

Options

Option Default Effect
remove_zero_width true Remove ZWSP, ZWNJ, ZWJ, word joiner, BOM (U+200B–200D, U+2060, U+FEFF).
remove_bidi true Remove bidirectional marks/controls (U+200E/200F, U+202A–202E, U+2066–2069, U+061C).
remove_invisible_math true Remove invisible math operators (U+2061–2064).
remove_variation_selectors true Remove variation selectors (U+FE00–FE0F, U+E0100–E01EF).
remove_tag_chars true Remove the Unicode Tags block (U+E0000–E007F).
remove_format_chars true Remove soft hyphen, CGJ, Hangul fillers, interlinear annotations, etc.
remove_braille_blank true Remove U+2800 BRAILLE PATTERN BLANK.
strip_control true Remove stray C0/C1 control characters (keeps TAB, LF, CR).
keep_emoji true Preserve ZWJ and variation selectors when they are part of a valid emoji sequence.
remove_citations false Remove AI-generated citations like (oaicite:5){index=5} or 【13†source】.
normalize_homoglyphs false Apply NFKC normalization to neutralize visually identical homoglyphs (requires ext-intl).
normalize_spaces true Fold unusual spaces (NBSP, thin space, ideographic space, …) to U+0020.
normalize_line_separators true U+2028 → \n, U+2029 → \n\n.
normalize_smart_quotes false Curly/angle quotes → straight ' and ".
normalize_dashes false Dashes and minus (U+2010–2015, U+2212) → -.
normalize_ellipsis false U+2026 → ....
collapse_whitespace false Collapse runs of horizontal whitespace, trim line-end spaces, cap blank lines.
trim false Trim leading/trailing whitespace of the whole string.

Docker

Demo

All versions of php-ai-text-sanitizer with dependencies

PHP Build Version
Package Version
Requires php Version ^8.1
ext-mbstring Version *
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