php - correct way to echo a link with a onclick javascript function -

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My question is how can I resize it correctly because the variable in the onclick function returns an undefined error

$ openchat = "john javascript: zero (0) 'onClick =' return chat (". $ Livenaam. ") '& Gt; . $ Livenaam "& lt; / a & gt; & lt; br & gt;"; Echo $ openchat;

I want to use it in a loop to send users a list online for chat

thanks, Richard

$ openchat = "& lt; a href = '

Javascript: void 0) 'onClick =' return chat (\ "". $ Livenaam. "\") '& Gt; $ Livenaam "& lt; / a & gt; & lt; br & gt;";

Or for increased security: 

  $ openchat = "& lt; a href = 'javascript: zero (0)' onClick = 'return Chat (\ "" .htmlspecialchars ($ livenaam, ENT_QUOTES). "\") '& Gt; Htmlspecialchars ($ livenaam, ENT_QUOTES) "& lt; / a & gt; & lt; br & gt;";

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