Question

How to compare string in PHP

Answer 1

$s1 = "abc";
$s2 = "ABC";
$r = strcmp($s1, $s2); // 'a' ascii is 95. 'A' ascii is 65. 'a' is bigger
echo $r . "<br>"; // 1
if ($r > 0)
    echo "s1 > s2";
else if ($r == 0)
         echo "s1 = s2";
     else
         echo "s2 > s1"; // s1 > s2


/*
run:
    
1
s1 > s2 

    
*/

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Answer 2

$s1 = "abc";
$s2 = "ABC";
if ($s1 > $s2)
    echo "s1 > s2";
else if ($s1 == $s2)
         echo "s1 = s2";
     else
         echo "s2 > s1"; // s1 > s2


/*
run:
    
s1 > s2 

    
*/

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Answer 3

$s1 = "abc";
$s2 = "ABC";
$r = strcasecmp($s1, $s2); // converts the strings to lowercase before comparing them
echo $r . "<br>"; // 0
if ($r > 0)
    echo "s1 > s2";
else if ($r == 0)
         echo "s1 = s2"; // s1 = s2
     else
         echo "s2 > s1";


/*
run:
    
0
s1 = s2 

    
*/

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Answer 4

$s1 = "abcd";
$s2 = "abcf";
$r = strncmp($s1, $s2, 3); // compare only the first 3 characters
echo $r . "<br>"; // 0
if ($r > 0)
    echo "s1 > s2";
else if ($r == 0)
         echo "s1 = s2"; // s1 = s2
     else
         echo "s2 > s1";


/*
run:
    
0
s1 = s2 

    
*/

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Answer 5

$s1 = "abcd";
$s2 = "ABCf";
$r = strncasecmp($s1, $s2, 3); // compare only the first 3 characters
echo $r . "<br>"; // 0
if ($r > 0)
    echo "s1 > s2";
else if ($r == 0)
         echo "s1 = s2"; // s1 = s2
     else
         echo "s2 > s1";


/*
run:
    
0
s1 = s2 

    
*/

70+ SQL courses for beginners and professionals