Php related questions about "red dot.

"Red Dot" in php... Why can't the content in $ arr [2] [$ id] be displayed only when the following red points are called? Confused & lt ;? Php & nbsp; include_once (& quot; conn. php & quot;); & nbsp; if ($ _ GET [I php's question about "red dot...
Why can't the content in $ arr [2] [$ id] be displayed only when the following red points are called? Confused
Include_once ("conn. php ");

If ($ _ GET [id] <= 60 ){
$ Con = file_get_contents ("http://it.sohu.com/7/1002/17/column203661721_32". $ _ GET [id]. ". shtml ");
$ Preg = "# · (. *) # iUs ";
Preg_match_all ($ preg, $ con, $ arr );
Foreach ($ arr [1] as $ id => $ v ){
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$ SQL = "INSERT INTO 'tmp _ url' ('id', 'title', 'URL') VALUES (NULL, '". $ arr [2] [$ id]
. "','". $ V ."');";

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Mysql_query ($ SQL );


}
$ _ GET [id] ++;
Echo "script location. href = 'ls. php? Id = ". $ _ GET [id]." 'script ";
}
?>



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Discussion
Why can't the content in $ arr [2] [$ id] be displayed only when the following red points are called? Confused
Include_once ("conn. php ");

If ($ _ GET [id] <= 60 ){
$ Con = file_get_contents ("http://it.sohu.com/7/1002/17/column203661721_32". $ _ GET [id]. ". shtml ");
$ P ......

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This red dot is equal to the string connector
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Red points connect the string, $ sum = "abc". "ef ";
Then $ sum = "abcdef ";
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$ SQL = "INSERT INTO 'tmp _ url' ('id', 'title', 'URL') VALUES (NULL, '{$ arr [2] [$ id]}', '". $ v. "');";