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<select name="select_1">
<option value=""></option>
<option value="value_1">option_1</option>
<option value="value_2">option_2</option>
.....
<option value="value_n">option_n</option>
</select></td>
<?php
echo '<select name="select_1" id="select_1">';
echo '<option value=""></option>';
for($i=1; $i<=10; $i++){
echo '<option value="value_'.$i.'">option_'.$i.'</option>';
}
echo '</select>';
$cur = 10;
echo '<script type="text/javascript">';
echo 'document.getElementById("select_1").value = "value_'.$cur.'";';
echo '</script>';
?>
$value_select_1=1;
$select_arr=array('value_1','value_2','value_3','value_4');
foreach ($select_arr as $value){
if(intval(substr($value,-1,1))==$value_select_1)
echo $value.' selected';
}