Why I have to call 'exit' after redirectio
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妖精总统
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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):问题: YouknowthatifyouwanttoredirectanuserinPHPyoucanusetheheaderfunction: header(\'Location:http://smowhere.com\'); Itisalsowellknownthatitisagoodp...
Evaluating a string as a mathematical expression i
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妖精总统
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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):问题: HowdoIparseandevaluateamathematicalexpressioninastring(e.g.\'1+1\')withoutinvokingeval(string)toyielditsnumericalvalue? Withthatexample,Iwantthe...
What does the variable $this mean in PHP?
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妖精总统
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可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试):问题: Iseethevariable$thisinPHPallthetimeandIhavenoideawhatit\'susedfor.I\'veneverpersonallyusedit,andthesearchenginesignorethe$andIendupwithasearchfor...