PHP Compare integers - php

Question

I have the following integers
7
77
0
20
in an array. I use them to check from where a call originated.
Numbers like 730010123, 772930013, 20391938.
What I need to do is I need a way to check if the number starts with 7 or 77 for an example.
Is there any way to do this in PHP and avoid a thousand if statements?
One issue I am having is that if I check if the number starts with 7 the numbers that start with 77 are being called as well. Note that 7 numbers are mobile and 77 are shared cost numbers and not equal in any way so I need to separate them.

Answer 1

if (substr($str, 0, 1) == '7') ||{
if (substr($str, 0, 2) == '77'){
//starts with '77'
} else {
//starts with '7'
}
}

Answer 2

I made a little example with a demo array, I hope you can use it:
$array = array(
7 => 'Other',
70 => 'Fryslan!',
20 => 'New York',
21 => 'Dublin',
23 => 'Amsterdam',
);
$number = 70010123;
$place = null;
foreach($array as $possibleMatch => $value) {
if (preg_match('/^' . (string)$possibleMatch . '/', (string)$number))
$place = $value;
}
echo $place;
The answer in this case is "Fryslan". You have to remember that 7 also matches in this case? So you may want to add some metric system in case of two matches.

Answer 3

Is this you want?
<?php
$myarray = array(730010123, 772930013, 20391938);
foreach($myarray as $value){
if(substr($value, 0, 2) == "77"){
echo "Starting With 77: <br/>";
echo $value;
echo "<br>";
}
if((substr($value, 0, 1) == "7")&&(substr($value, 0, 2) != "77")){
echo "Starting With 7: <br/>";
echo $value;
echo "<br>";
}
}
?>

Answer 4

You could use preg_match and array_filter for that
function check_digit($var) {
return preg_match("/^(7|77|0)\d+$/");
}
$array_to_be_check = array("730010123" , "772930013", "20391938");
print_r(array_filter($array_to_be_check, "check_digit"));

Answer 5

A way to do this is to handle the "integer" you received as a number as being a string.
Doing so by something like this:
$number = 772939913;
$filter = array (
'77' => 'type1',
'20' => 'type2',
'7' => 'type3',
'0' => 'type4');
$match = null;
foreach ($filter as $key => $val){
$comp = substr($number, 0, strlen($key));
if ($comp == $key){
$match = $key;
break;
}
}
if ($match !== null){
echo 'the type is: ' . $filter[$match];
//you can proceed with your task
}