Select all option values php mysql - php

Question

I'm trying to select all values from my MySQL database. Options a, b, and c work fine but I'm not sure of the syntax to select all three.
<option value="1">a</option>
<option value="2">b</option>
<option value="3">c</option>
<option value="1,2,3">All</option>

Answer 1

I think you want to use the select to fetch a item or all items if I understand your question correctly and by seeing your 'all' option's value.
If so then change your select option's value for all to <option value="all">all items</option>.
Then change your PHP file (where you posting to with the form) to this:
// is the all option send?
if($_POST['your_select'] === 'all') {
//query to get all the items (SELECT * FROM table)
} else {
// query with the post value as the id (SELECT * FROM table WHERE id = $_POST['your_select'])
}

Answer 2

i think you want multiple="multiple" it will allow you to select multiple
<select name="modules[]" multiple="multiple">
<option value="1">a</option>
<option value="2">b</option>
<option value="3">c</option>
<option value="1,2,3">All</option>
</select>
now you will get array of selected option which you can get by either GET or POST
to select all on selecting last you can use jquery like
$('option').click(function(){
if($(this).val() =='1,2,3'){
$("option").attr("selected", "selected");
}
})

Answer 3

Try this
<form action="my_page.php" method="post">
<select name="my_select">
<option value="1">a</option>
<option value="2">b</option>
<option value="3">c</option>
<option value="1,2,3">All</option>
</select>
<input type="submit" name="submit" value="Submit" />
</form>
<?php
# in my_page.php page
# put submitted value of the select tag in an array
# (submitted value in this case equals "1", "2", "3" or "1,2,3")
$values = explode(",", $_POST["my_select"]);
# get number of values in the array
$num_of_values = count($values);
# escape all values before using them in your sql statement
foreach ($values as $key => $val) {
$values["$key"] = mysql_real_escape_string($val);
}
# if we have more than 1 value in the array
if (count($values) > 1) {
$sql = "SELECT * FROM table_name WHERE "; # note the space after "WHERE" keyword
for ($i = 0; $i < $num_of_values; $i++) {
# this "if" statement is for removing the "OR" keyword from the sql statement
# when we reach the last value of the array
if ($i != $num_of_values - 1) {
$sql .= "column_name = '{$values[$i]}' OR "; # note the space after "OR"
} else { #if we reached the last value of the array then remove the "OR" keyword
$sql .= "column_name = '{$values[$i]}'";
}
}
# execute your query
$result = mysql_query($sql);
} else { # if we have only one value in the array
$result = mysql_query("SELECT * FROM table_name WHERE column_name = '{$values[0]}'");
}
?>