PHP String Functions by AMSOL e-Tutor

PHP String Functions

PHP String functions are helpful in maipulating strings, keep in mind strings are text matter in any website/program. If we want to convert a paragraph to lowecase, capitalize only first character or any other manipulation, string functions will be helpfull.

Convert text to lower case

echo strtolower('WELCOME TO AMSOL E-TUTOR');

Convert text to upper case

echo strtoupper('welcome to amsol e-tutor');

Convert first letter of text to upper case

echo ucfirst('abdul rehman');

Convert first letter of each word in a text to upper case

echo ucwords('abdul rehman baig ');

Comparing two strings, keep in mind PHP is case sensitive. It returns true if strings macthes 100%.

echo strcmp("AMSOL Kutur ","amsol Tutor");

Check similar text

$TEXT1 ="Bill Gates";
$TEXT2 = "Bill Betes";
$TEXT3 = similar_text($TEXT1, $TEXT2, $PERCENT);
echo ($TEXT3);
echo ($PERCENT;

Repeat any character n times,

echo $RPT = str_repeat("*", 95);

Find and replace text

$TEXT = "Learn PHP String functions";
$TXT_SEARCH = "String";
$TXT_REPLACE = "Number";
print $TEXT . "
";
$TEXT_NEW = str_replace($TXT_SEARCH, $TXT_REPLACE, $TEXT);
echo $TEXT_NEW;

Count words in a text

$num_of_words = str_word_count("The word count function");
print $num_of_words;

Count characters in a text

echo $CHARS = strlen("This is text text");

check a string for any pattern

$email = "test@amsol.biz";
$email_end = substr($email, strlen($email) - 4);
if ($email_end == ".biz" ) 
{
print "ends in .biz";
}
else {
print "doesn't end in .biz";
}

The trim() function removes whitespace from both sides of a string. We use mostly to purify the input entered by a user, where space character may be entered in start or end of a string.

$TXT = ' hello ';
eco trim($TXT);

The trim() function can also remove other predefined characters from both sides of a string.

$TXT = ' hello and welcome '
echo trim($str,"Hdw!");

Wrap a string into new lines when it reaches a specific length:

$str = "An example of a long word is: Supercalifragulistic";
echo wordwrap($str,15,"
\n");

Convert the predefined characters "<" (less than) and ">" (greater than) to HTML entities:

$str = "This is some bold text.";
echo htmlspecialchars($str);

The HTML output of the code above will be => This is some <b>bold</b> text.
and browser output of the code above will be => This is some bold text

Convert characters to HTML entities:

$TXT = 'Visit amsol.biz';
echo htmlentities($TXT);

The HTML output of the code above will be => <a href="https://www.w3schools.com">Go to w3schools.com</a>
The browser output of the code above will be => Visit amsol.biz

Split the string after each character and add a "." after each split.

$str = "Hello world!";
echo chunk_split($str,1,".");