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PHP code snippet – How to trim text ?

/* Removes whitespace from beginning and end of a string if
* the second parameter is omitted
* First parameter must be the string
* Second parameter is optional and can include an alternative character or set of characters.

// Example 1
$string = " Hello world ";
$trimmedString = trim($string);
// Output = 'Hello world',

// Example 2
$string = "babcabcHello worldabbaca";
$trimmedString = trim($string, 'abc');
// Output = 'Hello world',
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