php trim string to length
<?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';
only display part of string php
substr('abcdef', 1); // bcdef substr('abcdef', 1, 3); // bcd substr('abcdef', 0, 8); // abcdef substr('abcdef', -1, 1); // f
php string only letters
$result = preg_replace("/[^a-zA-Z0-9]+/", "", $s);
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