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here is PHP's "official" HTML entities table:

array (
  '"' => '"',
  '&' => '&',
  '\'' => ''',
  '<' => '&lt;',
  '>' => '&gt;',
  ' ' => '&nbsp;',
  '¡' => '&iexcl;',
  '¢' => '&cent;',
  '£' => '&pound;',
  '¤' => '&curren;',
  '¥' => '&yen;',
  '¦' => '&brvbar;',
  '§' => '&sect;',
  '¨' => '&uml;',
  '©' => '&copy;',
  'ª' => '&ordf;',
  '«' => '&laquo;',
  '¬' => '&not;',
  '­' => '&shy;',
  '®' => '&reg;',
  '¯' => '&macr;',
  '°' => '&deg;',
  '±' => '&plusmn;',
  '²' => '&sup2;',
  '³' => '&sup3;',
  '´' => '&acute;',
  'µ' => '&micro;',
  '¶' => '&para;',
  '·' => '&middot;',
  '¸' => '&cedil;',
  '¹' => '&sup1;',
  'º' => '&ordm;',
  '»' => '&raquo;',
  '¼' => '&frac14;',
  '½' => '&frac12;',
  '¾' => '&frac34;',
  '¿' => '&iquest;',
  'À' => '&Agrave;',
  'Á' => '&Aacute;',
  'Â' => '&Acirc;',
  'Ã' => '&Atilde;',
  'Ä' => '&Auml;',
  'Å' => '&Aring;',
  'Æ' => '&AElig;',
  'Ç' => '&Ccedil;',
  'È' => '&Egrave;',
  'É' => '&Eacute;',
  'Ê' => '&Ecirc;',
  'Ë' => '&Euml;',
  'Ì' => '&Igrave;',
  'Í' => '&Iacute;',
  'Î' => '&Icirc;',
  'Ï' => '&Iuml;',
  'Ð' => '&ETH;',
  'Ñ' => '&Ntilde;',
  'Ò' => '&Ograve;',
  'Ó' => '&Oacute;',
  'Ô' => '&Ocirc;',
  'Õ' => '&Otilde;',
  'Ö' => '&Ouml;',
  '×' => '&times;',
  'Ø' => '&Oslash;',
  'Ù' => '&Ugrave;',
  'Ú' => '&Uacute;',
  'Û' => '&Ucirc;',
  'Ü' => '&Uuml;',
  'Ý' => '&Yacute;',
  'Þ' => '&THORN;',
  'ß' => '&szlig;',
  'à' => '&agrave;',
  'á' => '&aacute;',
  'â' => '&acirc;',
  'ã' => '&atilde;',
  'ä' => '&auml;',
  'å' => '&aring;',
  'æ' => '&aelig;',
  'ç' => '&ccedil;',
  'è' => '&egrave;',
  'é' => '&eacute;',
  'ê' => '&ecirc;',
  'ë' => '&euml;',
  'ì' => '&igrave;',
  'í' => '&iacute;',
  'î' => '&icirc;',
  'ï' => '&iuml;',
  'ð' => '&eth;',
  'ñ' => '&ntilde;',
  'ò' => '&ograve;',
  'ó' => '&oacute;',
  'ô' => '&ocirc;',
  'õ' => '&otilde;',
  'ö' => '&ouml;',
  '÷' => '&divide;',
  'ø' => '&oslash;',
  'ù' => '&ugrave;',
  'ú' => '&uacute;',
  'û' => '&ucirc;',
  'ü' => '&uuml;',
  'ý' => '&yacute;',
  'þ' => '&thorn;',
  'ÿ' => '&yuml;',
  'Œ' => '&OElig;',
  'œ' => '&oelig;',
  'Š' => '&Scaron;',
  'š' => '&scaron;',
  'Ÿ' => '&Yuml;',
  'ƒ' => '&fnof;',
  'ˆ' => '&circ;',
  '˜' => '&tilde;',
  'Α' => '&Alpha;',
  'Β' => '&Beta;',
  'Γ' => '&Gamma;',
  'Δ' => '&Delta;',
  'Ε' => '&Epsilon;',
  'Ζ' => '&Zeta;',
  'Η' => '&Eta;',
  'Θ' => '&Theta;',
  'Ι' => '&Iota;',
  'Κ' => '&Kappa;',
  'Λ' => '&Lambda;',
  'Μ' => '&Mu;',
  'Ν' => '&Nu;',
  'Ξ' => '&Xi;',
  'Ο' => '&Omicron;',
  'Π' => '&Pi;',
  'Ρ' => '&Rho;',
  'Σ' => '&Sigma;',
  'Τ' => '&Tau;',
  'Υ' => '&Upsilon;',
  'Φ' => '&Phi;',
  'Χ' => '&Chi;',
  'Ψ' => '&Psi;',
  'Ω' => '&Omega;',
  'α' => '&alpha;',
  'β' => '&beta;',
  'γ' => '&gamma;',
  'δ' => '&delta;',
  'ε' => '&epsilon;',
  'ζ' => '&zeta;',
  'η' => '&eta;',
  'θ' => '&theta;',
  'ι' => '&iota;',
  'κ' => '&kappa;',
  'λ' => '&lambda;',
  'μ' => '&mu;',
  'ν' => '&nu;',
  'ξ' => '&xi;',
  'ο' => '&omicron;',
  'π' => '&pi;',
  'ρ' => '&rho;',
  'ς' => '&sigmaf;',
  'σ' => '&sigma;',
  'τ' => '&tau;',
  'υ' => '&upsilon;',
  'φ' => '&phi;',
  'χ' => '&chi;',
  'ψ' => '&psi;',
  'ω' => '&omega;',
  'ϑ' => '&thetasym;',
  'ϒ' => '&upsih;',
  'ϖ' => '&piv;',
  ' ' => '&ensp;',
  ' ' => '&emsp;',
  ' ' => '&thinsp;',
  '‌' => '&zwnj;',
  '‍' => '&zwj;',
  '‎' => '&lrm;',
  '‏' => '&rlm;',
  '–' => '&ndash;',
  '—' => '&mdash;',
  '‘' => '&lsquo;',
  '’' => '&rsquo;',
  '‚' => '&sbquo;',
  '“' => '&ldquo;',
  '”' => '&rdquo;',
  '„' => '&bdquo;',
  '†' => '&dagger;',
  '‡' => '&Dagger;',
  '•' => '&bull;',
  '…' => '&hellip;',
  '‰' => '&permil;',
  '′' => '&prime;',
  '″' => '&Prime;',
  '‹' => '&lsaquo;',
  '›' => '&rsaquo;',
  '‾' => '&oline;',
  '⁄' => '&frasl;',
  '€' => '&euro;',
  'ℑ' => '&image;',
  '℘' => '&weierp;',
  'ℜ' => '&real;',
  '™' => '&trade;',
  'ℵ' => '&alefsym;',
  '←' => '&larr;',
  '↑' => '&uarr;',
  '→' => '&rarr;',
  '↓' => '&darr;',
  '↔' => '&harr;',
  '↵' => '&crarr;',
  '⇐' => '&lArr;',
  '⇑' => '&uArr;',
  '⇒' => '&rArr;',
  '⇓' => '&dArr;',
  '⇔' => '&hArr;',
  '∀' => '&forall;',
  '∂' => '&part;',
  '∃' => '&exist;',
  '∅' => '&empty;',
  '∇' => '&nabla;',
  '∈' => '&isin;',
  '∉' => '&notin;',
  '∋' => '&ni;',
  '∏' => '&prod;',
  '∑' => '&sum;',
  '−' => '&minus;',
  '∗' => '&lowast;',
  '√' => '&radic;',
  '∝' => '&prop;',
  '∞' => '&infin;',
  '∠' => '&ang;',
  '∧' => '&and;',
  '∨' => '&or;',
  '∩' => '&cap;',
  '∪' => '&cup;',
  '∫' => '&int;',
  '∴' => '&there4;',
  '∼' => '&sim;',
  '≅' => '&cong;',
  '≈' => '&asymp;',
  '≠' => '&ne;',
  '≡' => '&equiv;',
  '≤' => '&le;',
  '≥' => '&ge;',
  '⊂' => '&sub;',
  '⊃' => '&sup;',
  '⊄' => '&nsub;',
  '⊆' => '&sube;',
  '⊇' => '&supe;',
  '⊕' => '&oplus;',
  '⊗' => '&otimes;',
  '⊥' => '&perp;',
  '⋅' => '&sdot;',
  '⌈' => '&lceil;',
  '⌉' => '&rceil;',
  '⌊' => '&lfloor;',
  '⌋' => '&rfloor;',
  '⟨' => '&lang;',
  '⟩' => '&rang;',
  '◊' => '&loz;',
  '♠' => '&spades;',
  '♣' => '&clubs;',
  '♥' => '&hearts;',
  '♦' => '&diams;',
)

here is our HTML entities table, also showing if your browser supports each entity:

	array(