textarea
测试页面代码:复制代码 代码如下:
$content=empty($_POST['content'])?null:trim($_POST['content']);
if(!empty($content))echo str_replace("\r",'rl',nl2br($content));
echo "\r".'
----------分割线----------------------'."\r";
if(!empty($content))echo str_replace("\n",'nl',nl2br($content));
echo "\n".'
----------分割线----------------------'."\n";
if(!empty($content))echo str_replace("\r",'rl',str_replace("\n",'nl',nl2br($content)));
echo "\r".'
----------分割线----------------------
'."\n";
echo 'hello'."\n".'boys!';
echo 'hello'."\r".'boys!';
?>
在浏览器中打开后,在表单中输入:
按提交后,浏览器中显示结果如下:
在记事本可可看到如下结果:
从以上结果可见:
1.PHP函数nl2br()是在字符串中的每个新行(\r\n)之前插入HTML换行符:
;
2.Windows下的换行是(\r\n);
3.在记事本中,\r或\n均有换行的功能;

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APHPDependencyInjectionContainerisatoolthatmanagesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itactsasacentralhubforcreatingandinjectingdependencies,thusreducingtightcouplingandeasingunittesting.

Select DependencyInjection (DI) for large applications, ServiceLocator is suitable for small projects or prototypes. 1) DI improves the testability and modularity of the code through constructor injection. 2) ServiceLocator obtains services through center registration, which is convenient but may lead to an increase in code coupling.

PHPapplicationscanbeoptimizedforspeedandefficiencyby:1)enablingopcacheinphp.ini,2)usingpreparedstatementswithPDOfordatabasequeries,3)replacingloopswitharray_filterandarray_mapfordataprocessing,4)configuringNginxasareverseproxy,5)implementingcachingwi

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