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substr in php

Posted on November 26, 2021November 26, 2021 By christo No Comments on substr in php

If you know where the data that you are interested in lies in a larger string, you can copy it out with the substr() function:

$piece = substr(string, start [, length ]);

The start argument is the position in string at which to begin copying, with 0 meaning the start of the string. The length argument is the number of characters to copy (the default is to copy until the end of the string). For example:

$name = “Fred Flintstone”;
$fluff = substr($name, 6, 4); // $fluff is “lint”
$sound = substr($name, 11); // $sound is “tone”

More eample of substr in php

<?php
$rest = substr("abcdef", -1);    // returns "f"
$rest = substr("abcdef", -2);    // returns "ef"
$rest = substr("abcdef", -3, 1); // returns "d"
?>
<?php
$rest = substr("abcdef", 0, -1);  // returns "abcde"
$rest = substr("abcdef", 2, -1);  // returns "cde"
$rest = substr("abcdef", 4, -4);  // returns ""; prior to PHP 8.0.0, false was returned
$rest = substr("abcdef", -3, -1); // returns "de"
?>
<?php
echo substr('abcdef', 1);     // bcdef
echo substr('abcdef', 1, 3);  // bcd
echo substr('abcdef', 0, 4);  // abcd
echo substr('abcdef', 0, 8);  // abcdef
echo substr('abcdef', -1, 1); // f

// Accessing single characters in a string
// can also be achieved using "square brackets"
$string = 'abcdef';
echo $string[0];                 // a
echo $string[3];                 // d
echo $string[strlen($string)-1]; // f

?>

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