<?php
$stripped = str_replace(' ', '', "10 1000 0000 000");
echo $stripped;

<?php
$name = "Yeasin_ahammed_apon"
#str_replace('what u want to replace', 'with what ', $name);
str_replace('_', ' ', $name);
echo $name;
# output: Yeasin ahammed apon
?>
#str_replace('what u want to replace', 'with what ', $name);

<?php
$string = "DelftStack is a best platform.....";
echo "Output: " . rtrim($string, ".");
?> Output: DelftStack is a best platform

<?php
$mainstr = "@@PHP@Programming!!!.";
echo "Text before remove:\n" . $mainstr;
echo "\n\nText after remove: \n" . trim($mainstr, '@!.');
?>

<?php
$mainstr = "<h2>Welcome to <b>PHPWorld</b></h2>";
echo "Text before remove: \n" . $mainstr;
echo "\n\nText after remove: \n" . str_ireplace(array('&lt;b&gt;', '&lt;/b&gt;', '&lt;h2&gt;', '&lt;/h2&gt;'), '', htmlspecialchars($mainstr));
?> output: Text before remove:
<h2>Welcome to <b>PHPWorld</b></h2>
Text after remove:
Welcome to PHPWorld

<?php
$strTemplate = "My name is :name, not :name2.";
$strParams = [ ':name' => 'Dave', 'Dave' => ':name2 or :password', ':name2' => 'Steve', ':pass' => '7hf2348', ];
echo "\n" . strtr($strTemplate, $strParams) . "\n";
echo "\n" . str_replace(array_keys($strParams), array_values($strParams), $strTemplate) . "\n";
?> Output:
My name is Dave, not Steve.
My name is Steve or 7hf2348word, not Steve or 7hf2348word2.