PHP Program to Check if a String Contains Uppercase, Lowercase, Special Characters and Numeric Values

Last Updated : 05 Jun, 2024

Given a String, the task is to check whether the given string contains uppercase, lowercase, special characters, and numeric values in PHP. When working with strings in PHP, it's often necessary to determine the presence of certain character types within the string, such as uppercase letters, lowercase letters, special characters, and numeric values.

Examples:

Input: str = "GeeksforGeeks123@#$"  Output: Yes  Explanation: The given string contains uppercase  characters('G', 'F'), lowercase characters('e', 'k', 's', 'o', 'r'),  special characters( '#', '@'), and numeric values('1', '2', '3').  Therefore, the output is Yes.    Input: str = "GeeksforGeeks"  Output: No  Explanation: The given string contains only uppercase  characters and lowercase characters. Therefore, the  output is No.

here are some common approaches:

Table of Content

Using Built-in Functions

PHP provides several built-in functions that help determine the presence of specific character types in a string.

PHP

<?php   function checkChars($str) {      $upperCase = preg_match('/[A-Z]/', $str);      $lowerCase = preg_match('/[a-z]/', $str);      $specialChar = preg_match('/[^A-Za-z0-9]/', $str);      $numericVal = preg_match('/[0-9]/', $str);       return [          'Uppercase' => $upperCase,          'Lowercase' => $lowerCase,          'Special Characters' => $specialChar,          'Numeric Values' => $numericVal,      ];  }   // Driver code  $str = "GeeksforGeeks123@#$";  $result = checkChars($str);   foreach ($result as $type => $hasType) {      echo "$type: " . ($hasType ? 'Yes' : 'No') . "\n";  }   ?>

Output

Uppercase: Yes Lowercase: Yes Special Characters: Yes Numeric Values: Yes

Using Loop and ctype Functions

Another approach involves iterating through each character in the string and using ctype functions to check their types.

PHP

<?php  function checkChars($str) {      $upperCase = $lowerCase = $specialChar = $numericVal = false;       for ($i = 0; $i < strlen($str); $i++) {          if (ctype_upper($str[$i])) {              $upperCase = true;          } else if (ctype_lower($str[$i])) {              $lowerCase = true;          } else if (ctype_digit($str[$i])) {              $numericVal = true;          } else {              $specialChar = true;          }      }       return [          'Uppercase' => $upperCase,          'Lowercase' => $lowerCase,          'Special Characters' => $specialChar,          'Numeric Values' => $numericVal,      ];  }   // Driver code  $str = "GeeksforGeeks123@#$";  $result = checkChars($str);   foreach ($result as $type => $hasType) {      echo "$type: " . ($hasType ? 'Yes' : 'No') . "\n";  }  ?>

Output

Uppercase: Yes Lowercase: Yes Special Characters: Yes Numeric Values: Yes

Using filter_var and Custom Validation

This approach uses filter_var in combination with custom validation logic to check for the presence of uppercase, lowercase, special characters, and numeric values.

PHP

<?php // Nikunj Sonigara function checkChars($str) {     $upperCase = $lowerCase = $specialChar = $numericVal = false;      $upperCase = filter_var($str, FILTER_VALIDATE_REGEXP,                              array("options"=>array("regexp"=>"/[A-Z]/"))) !== false;     $lowerCase = filter_var($str, FILTER_VALIDATE_REGEXP,                              array("options"=>array("regexp"=>"/[a-z]/"))) !== false;     $specialChar = filter_var($str, FILTER_VALIDATE_REGEXP,                                array("options"=>array("regexp"=>"/[^A-Za-z0-9]/"))                              ) !== false;     $numericVal = filter_var($str, FILTER_VALIDATE_REGEXP,                               array("options"=>array("regexp"=>"/[0-9]/"))) !== false;      return [         'Uppercase' => $upperCase,         'Lowercase' => $lowerCase,         'Special Characters' => $specialChar,         'Numeric Values' => $numericVal,     ]; }  // Driver code $str = "GeeksforGeeks123@#$"; $result = checkChars($str);  foreach ($result as $type => $hasType) {     echo "$type: " . ($hasType ? 'Yes' : 'No') . "\n"; }  ?>

Output

Uppercase: Yes Lowercase: Yes Special Characters: Yes Numeric Values: Yes

PHP Program To Check If A String Is Substring Of Another

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Article Tags :

PHP Program to Check if a String Contains Uppercase, Lowercase, Special Characters and Numeric Values

Using Built-in Functions

Using Loop and ctype Functions

Using filter_var and Custom Validation

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