php check if string contains only numbers code example

Example 1: php filter only numbers

$output = preg_replace( '/[^0-9]/', '', $string );

Example 2: check if string is number or not php

$var_num = "1";
$var_str = "Hello World";

var_dump( is_numeric($var_num), is_numeric($var_str) );

/* 
Output -
 bool(true)
 bool(false)
*/

Example 3: php check if string or number

<?php if (is_numeric(887)) { echo "Yes"; } else { echo "No"; } ?>

Example 4: check if includes numbers php

if (preg_match('~[0-9]+~', $string)) {
    echo 'string with numbers';
}

Example 5: check value contains numbers or letters php

ctype_digit(string text);

Parameter Used:
The ctype_digit() function in PHP accepts only one parameter.

text : Its mandatory parameter which specifies the tested string.

Return Values:
It returns TRUE if all characters of the string are numeric otherwise 
  return FALSE.
  
Input  : '789495001'
Output : TRUE
Explanation : All digits, return True

Input  : 'adc123' or '789.0877'
Output : FALSE
Explanation: String contains number and string or floating point, 
return false.

Example 6: php check if string contains number

if (preg_match('/[A-Za-z]/', $myString) && preg_match('/[0-9]/', $myString))
{
    echo 'Contains at least one letter and one number';
}