Substring Extract

substr copies part of a string by start position and length.

substring_extract.php

<?php
$start = ;
$text = "debug trace";
$piece = substr($text, $start, 5);
$pieceLength = strlen($piece);

echo "start=" . $start . "\n";
echo "piece=" . $piece . "\n";
echo "pieceLength=" . $pieceLength . "\n";

<?php
$start = ;
$text = "debug trace";
$piece = substr($text, $start, 5);
$pieceLength = strlen($piece);

echo "start=" . $start . "\n";
echo "piece=" . $piece . "\n";
echo "pieceLength=" . $pieceLength . "\n";

<?php
$start = ;
$text = "debug trace";
$piece = substr($text, $start, 5);
$pieceLength = strlen($piece);

echo "start=" . $start . "\n";
echo "piece=" . $piece . "\n";
echo "pieceLength=" . $pieceLength . "\n";

substring A substring is a smaller slice of text taken from a larger string.