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PHP is_numeric() function
##is_numeric() function is used to detect whether a variable Is a number or a string of numbers.
Grammar (Recommended learning: PHP video tutorial)
bool is_numeric ( mixed $var )
Parameter description:
$var: Variable to be detected.Return value
Returns TRUE if the specified variable is a number or numeric string, otherwise returns FALSE.
Example
<?php $var_name1=678; $var_name2="a678"; $var_name3="678"; $var_name4="runoob.com"; $var_name5=698.99; $var_name6=array("a1","a2"); $var_name7=+125689.66; if (is_numeric($var_name1)) { echo "$var_name1 是数字" . PHP_EOL; } else { echo "$var_name1 不是数字" . PHP_EOL ; } if (is_numeric($var_name2)) { echo "$var_name2 是数字" . PHP_EOL ; } else { echo "$var_name2 不是数字" . PHP_EOL ; } $result=is_numeric($var_name3); echo "[ $var_name3 是数字吗? ]" .var_dump($result) . PHP_EOL; $result=is_numeric($var_name4); echo "[ $var_name4 是数字吗? ]" .var_dump($result) . PHP_EOL; $result=is_numeric($var_name5); echo "[ $var_name5 是数字吗? ]" .var_dump($result) . PHP_EOL; $result=is_numeric($var_name6); echo "[ $var_name6 是数字吗? ]" .var_dump($result) . PHP_EOL; $result=is_numeric($var_name7); echo "[ $var_name7 是数字吗? ]" .var_dump($result);
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