Check if variable starts with 'http'

Question

I\'m sure this is a simple solution, just haven\'t found exactly what I needed.

Using php, i have a variable $source. I wanna check if $source starts with \'http\'.

Answer 1

As of PHP 8.0 there is method str_starts_with implemented:

if (str_starts_with($source, 'http')) {
    $source = "<a href='$source'>$source</a>";
} 

Answer 2

if(strpos($source, 'http') === 0)
    //Do stuff

Answer 3

You want the substr() function.

if(substr($source, 0, 4) == "http") {
   $source = "<a href='$source'>$source</a>";
}

Answer 4

if (strpos($source, 'http') === 0) {
    $source = "<a href=\"$source\">$source</a>";
}

Note I use ===, not == because strpos returns boolean false if the string does not contain the match. Zero is falsey in PHP, so a strict equality check is necessary to remove ambiguity.

Reference:

http://php.net/strpos

http://php.net/operators.comparison

Answer 5

Use substr:

if (substr($source, 0, 4) === 'http')

Answer 6

if(preg_match('/^(http)/', $source)){
...
}