echo数组单元的值不全解决方案

echo数组单元的值不全
数组的为

<br />Array<br />(<br />    [title] => 初一上册数学测试题<br />    [id] => 6<br />    [subject] => 14<br />    [parts] => [["单选","100",1]]<br />    [topic] => [["1","100"]]<br />    [json] => [["6","<p style='text-indent:28px;line-height:200%'><span style=';color:rgb(0,0,0);font-size:14px;font-family:<br />    [#39;'>小红做一道数学题“</span><span_style] => ';color:rgb(0,0,0);font-weight:bold;font-size:14px;font-family:<br />    [#39;'>两个多项式<span_style] => 'font-family:Times New Roman'>A</span><span style='font-family:宋体'>、</span><span style='font-family:Times New Roman'>B</span><span style='font-family:宋体'>，</span><span style='font-family:Times New Roman'>B</span><span style='font-family:宋体'>为</span></span><img  src='http://www.exam.com/Public/Js/Home/ueditor/themes/default/images/spacer.gif' word_img='file:///C:\Users\hp\AppData\Local\Temp\ksohtml\wps_clip_image-14927.png'   style="max-width:90%"  style="max-width:90%"  style="max-width:90%"/ alt="echo数组单元的值不全解决方案" ><span style=';color:rgb(0,0,0);font-weight:bold;font-size:14px;font-family:<br />    [#39;'>，试求<span_style] => 'font-family:Times New Roman'>A B</span><span style='font-family:宋体'>的值</span></span><span style=';color:rgb(0,0,0);font-size:14px;font-family:<br />    [#39;'>”。小红误将<span_style] => 'font-family:Times New Roman'>A B</span><span style='font-family:宋体'>看成</span><span style='font-family:Times New Roman'>A</span></span><span style=';color:rgb(0,0,0);font-size:14px;font-family:<br />    [#39;'>－</span><span_style] => ';color:rgb(0,0,0);font-size:14px;font-family:<br />    [#39;'>B<span_style] => 'font-family:宋体'>，结果答案（计算正确）为</span></span><img  src='http://www.exam.com/Public/Js/Home/ueditor/themes/default/images/spacer.gif' word_img='file:///C:\Users\hp\AppData\Local\Temp\ksohtml\wps_clip_image-30836.png'   style="max-width:90%"  style="max-width:90%"  style="max-width:90%"/ alt="echo数组单元的值不全解决方案" ><span style=';color:rgb(0,0,0);font-size:14px;font-family:<br />    [#39;'>．</span></p><p_style] => 'text-indent:21px;line-height:200%'><span style=';color:rgb(0,0,0);font-size:14px;font-family:<br />    [#39;'>（<span_style] => 'font-family:Times New Roman'>2</span><span style='font-family:宋体'>）求出当</span></span><span style=';color:rgb(0,0,0);font-style:italic;font-size:14px;font-family:<br />    [#39;'>x</span><span_style] => ';color:rgb(0,0,0);font-size:14px;font-family:<br />    [#39;'>] => 3<span style='font-family:宋体'>时</span><span style='font-family:Times New Roman'>A B</span><span style='font-family:宋体'>的值</span><span style='font-family:Times New Roman'>.</span></span></p><p><br/></p>",1,"100"]]<br />    [total] => 100<br />)<br />

我在打印其中的json键时，却没打印全，显示

<br />[["6","<p style='text-indent:28px;line-height:200%'><span style=';color:rgb(0,0,0);font-size:14px;font-family:<br />

这是为毛，命名数组里都有，可是打印单独的值却显示不全，哪位大大能够指点迷津，不甚感激!!!

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------解决方案--------------------
请输出var_export($arr)结构;