About
In this code snippet, we’ll learn how to work with strings in PHP.
More specifically we’ll learn how to concatenate(join) strings, trim white spaces, make a string lower or upper case, get its length, check if it contains a substring and get its position, replace a substring, remove tags and slashes, split a string into an array on a specific character and join a string array back into a string.
Note: I covered just the string functions I found myself using the most. Here is the full list of string functions.
Let’s see the example code below.
Code:
<?php
//Concatenate strings with the . operator.
$myString = "Hello" . "" . "World! ";
//Trims whitespace.
echo "String length: " . trim($myString);
echo "<br>";
//Makes string lowercase.
echo "String to lower case: " . strtolower($myString);
echo "<br>";
//Makes string uppercase.
echo "String to upper case: " . strtoupper($myString);
echo "<br>";
//Get string length.
echo "String length: " . strlen($myString);
echo "<br>";
//Checks if a string contains a substring.
echo "Contains 'World': " . str_contains($myString, "World");
echo "<br>";
//Gets position of the first substring.
echo "Position of 'World': " . stripos($myString, "World");
echo "<br>";
//Replace substring.
echo "Replace 'Hello': " . str_replace("Hello", "Goodbye", $myString);
echo "<br>";
//Removes slashes from string.
echo "Strip slashes: " . stripslashes("File\Name.txt");
echo "<br>";
//Removes tags from string.
echo "Remove tags: " . strip_tags("<h1>Hello World!</h1>");
echo "<br>";
//Split string into an array of strigs on a certain character.
$charArray = explode(" ", $myString);
echo "Explode: ";
echo "<pre>";
print_r($charArray);
echo "</pre>";
echo "<br>";
//Makes string from a string array.
echo "Implode: " . implode($charArray);
<?php
//Concatenate strings with the . operator.
$myString = "Hello" . "" . "World! ";
//Trims whitespace.
echo "String length: " . trim($myString);
echo "<br>";
//Makes string lowercase.
echo "String to lower case: " . strtolower($myString);
echo "<br>";
//Makes string uppercase.
echo "String to upper case: " . strtoupper($myString);
echo "<br>";
//Get string length.
echo "String length: " . strlen($myString);
echo "<br>";
//Checks if a string contains a substring.
echo "Contains 'World': " . str_contains($myString, "World");
echo "<br>";
//Gets position of the first substring.
echo "Position of 'World': " . stripos($myString, "World");
echo "<br>";
//Replace substring.
echo "Replace 'Hello': " . str_replace("Hello", "Goodbye", $myString);
echo "<br>";
//Removes slashes from string.
echo "Strip slashes: " . stripslashes("File\Name.txt");
echo "<br>";
//Removes tags from string.
echo "Remove tags: " . strip_tags("<h1>Hello World!</h1>");
echo "<br>";
//Split string into an array of strigs on a certain character.
$charArray = explode(" ", $myString);
echo "Explode: ";
echo "<pre>";
print_r($charArray);
echo "</pre>";
echo "<br>";
//Makes string from a string array.
echo "Implode: " . implode($charArray);
<?php
//Concatenate strings with the . operator.
$myString = "Hello" . "" . "World! ";
//Trims whitespace.
echo "String length: " . trim($myString);
echo "<br>";
//Makes string lowercase.
echo "String to lower case: " . strtolower($myString);
echo "<br>";
//Makes string uppercase.
echo "String to upper case: " . strtoupper($myString);
echo "<br>";
//Get string length.
echo "String length: " . strlen($myString);
echo "<br>";
//Checks if a string contains a substring.
echo "Contains 'World': " . str_contains($myString, "World");
echo "<br>";
//Gets position of the first substring.
echo "Position of 'World': " . stripos($myString, "World");
echo "<br>";
//Replace substring.
echo "Replace 'Hello': " . str_replace("Hello", "Goodbye", $myString);
echo "<br>";
//Removes slashes from string.
echo "Strip slashes: " . stripslashes("File\Name.txt");
echo "<br>";
//Removes tags from string.
echo "Remove tags: " . strip_tags("<h1>Hello World!</h1>");
echo "<br>";
//Split string into an array of strigs on a certain character.
$charArray = explode(" ", $myString);
echo "Explode: ";
echo "<pre>";
print_r($charArray);
echo "</pre>";
echo "<br>";
//Makes string from a string array.
echo "Implode: " . implode($charArray); Resulting Output:
