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$abc='my name is tome';
echo $abc //½á¹ûÊÇ:my name is tom
echo '$abc' //½á¹ûÊÇ:$abc
echo "$abc" //½á¹ûÊÇ:my name is tom
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select    *    from    abc_table where user_name='abc';
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SQLstr = "select    *    from abc_table where user _name= 'abc'" ;
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$user_name = $_REQUEST['user_name']; //×Ö·û´®±äÁ¿
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$user=array ("name"=>
$_REQUEST['user_name‘,"age"=>$_REQUEST['age'];//Êý×é±äÁ¿
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SQLstr = "select    *    from abc_table where user_name = ' " .
$user_name . " ' ";
SQLstr = "select * from abc_table where user_name = ' " .
$user["name"] . " ' ";
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SQLstr="select * from abc_table where user_name = ' abc ' " ;
SQLstr="select * from abc_table where user_name =' " . $user _name .
" ' ";
SQLstr="select * from abc_table where user_name =' " . $user["name"]
. " ' ";
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